================================================================================


                               MARKEL CORPORATION


                               __________________


                               __________________


                                    INDENTURE

                          Dated as of January 13, 1997
                          ____________________________


                            THE CHASE MANHATTAN BANK


                                   as Trustee

                                ________________


            8.71% JUNIOR SUBORDINATED DEFERRABLE INTEREST DEBENTURES


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                             *CROSS REFERENCE TABLE


TRUST INDENTURE
ACT SECTION                         INDENTURE SECTION

310 (a) (1) .......................     6.09
    (a) (2) .......................     6.09
310 (a) (3) .......................     N/A
    (a) (4) .......................     N/A
310 (a) (5) .......................     6.10, 6.11
310 (b) ...........................     6.08
310 (c) ...........................     N/A
311 (a) and (b) ...................     6.13
311 (c) ...........................     N/A
312 (a) ...........................     4.01, 4.02
312 (b) and (c) ...................     4.02
313 ...............................     4.04
314 (a) ...........................     4.03
314 (b) ...........................     N/A
314 (c) ...........................     13.06
314 (e) ...........................     13.06
314 (f) ...........................     N/A
315 (a) (c) and (d) ...............     6.01
315 (b) ...........................     5.08
315 (e) ...........................     5.09
316 (a) (1) .......................     5.07
316 (a) (2) .......................     N/A
316 (a) last sentence .............     2.09, 7.04
316 (b) ...........................     9.02
316 (c) ...........................     N/A
317 (a) ...........................     5.02, 5.05
317 (b) ...........................     3.04, 6.05
318 (a) and (c) ...................     13.08

_________________________________
* THIS CROSS REFERENCE TABLE IS NOT PART OF THE INDENTURE AS EXECUTED AND SHALL
  NOT AFFECT THE INTERPRETATION OF ANY OF ITS TERMS OR PROVISIONS






                               Table of Contents


                                                                                                               Page
                                                                                                               ----

                                   ARTICLE I.
                                   DEFINITIONS
 
         SECTION 1.01.  Definitions.............................................................................  1
                  Additional Sums...............................................................................  1
                  Adjusted Treasury Rate........................................................................  2
                  Adverse Tax Consequence.......................................................................  2
                  Affiliate.....................................................................................  2
                  Authenticating Agent..........................................................................  2
                  Bankruptcy Law................................................................................  2
                  Board of Directors............................................................................  2
                  Board Resolution..............................................................................  2
                  Business Day..................................................................................  2
                  Capital Leases................................................................................  3
                  Capital Securities............................................................................  3
                  Capital Securities Guarantee..................................................................  3
                  Commission....................................................................................  3
                  Common Securities.............................................................................  3
                  Common Securities Guarantee...................................................................  3
                  Common Stock..................................................................................  4
                  Company  .....................................................................................  4
                  Company Request...............................................................................  4
                  Comparable Treasury Issue.....................................................................  4
                  Comparable Treasury Price.....................................................................  4
                  Compounded Interest...........................................................................  4
                  Conditional Tax Redemption Event..............................................................  4
                  Contingent Obligation.........................................................................  4
                  Credit Agreement..............................................................................  5
                  Custodian.....................................................................................  5
                  Declaration...................................................................................  5
                  Default  .....................................................................................  5
                  Deferred Interest.............................................................................  5
                  Definitive Securities.........................................................................  5
                  Depositary....................................................................................  5
                  Dissolution Event.............................................................................  5
                  Event of Default..............................................................................  6
                  Exchange Act..................................................................................  6



                                       i



                           Table of Contents (cont'd)




                                                                                                               Page
                                                                                                               ----

 
                  Exchange Offer................................................................................  6
                  Extended Interest Payment Period..............................................................  6
                  GAAP     .....................................................................................  6
                  Global Security...............................................................................  6
                  Guarantees....................................................................................  6
                  Hedging Agreement.............................................................................  6
                  Indebtedness for Money Borrowed...............................................................  6
                  Indenture.....................................................................................  7
                  Initial Optional Prepayment Date..............................................................  7
                  Interest Payment Date.........................................................................  7
                  Investment Company Event......................................................................  7
                  Issue Date....................................................................................  7
                  Lien     .....................................................................................  7
                  Liquidated Damages............................................................................  7
                  Markel Capital Trust..........................................................................  7
                  Maturity Date.................................................................................  7
                  Mortgage .....................................................................................  7
                  Non Book-Entry Capital Securities.............................................................  8
                  Officers .....................................................................................  8
                  Officers' Certificate.........................................................................  8
                  Opinion of Counsel............................................................................  8
                  Optional Prepayment Price.....................................................................  8
                  Other Debentures..............................................................................  8
                  Other Guarantees..............................................................................  8
                  outstanding...................................................................................  8
                  Person   .....................................................................................  9
                  Predecessor Security..........................................................................  9
                  Prepayment Price..............................................................................  9
                  Principal office of the Trustee...............................................................  9
                  Property Trustee..............................................................................  9
                  Purchase Agreement............................................................................  9
                  Qualified Debt Obligations....................................................................  9
                  Quotation Agent............................................................................... 10
                  Reference Treasury Dealer..................................................................... 10
                  Reference Treasury Dealer Quotations.......................................................... 10
                  Registration Rights Agreement................................................................. 10
                  Responsible Officer........................................................................... 10




                                       ii




                           Table of Contents (cont'd)



                                                                                                               Page
                                                                                                               ----

 

                  Restricted Security........................................................................... 10
                  Rule 144A..................................................................................... 11
                  Securities.................................................................................... 11
                  Securities Act................................................................................ 11
                  Securityholder................................................................................ 11
                  Security Register............................................................................. 11
                  Senior Indebtedness........................................................................... 11
                  Series A Securities........................................................................... 11
                  Series B Securities........................................................................... 11
                  Special Event................................................................................. 12
                  Special Event Prepayment Price................................................................ 12
                  Subsidiary.................................................................................... 12
                  Tax Event..................................................................................... 12
                  Tax Event Maturity Advancement................................................................ 13
                  Trustee  ..................................................................................... 13
                  Trust Indenture Act of 1939................................................................... 13
                  Trust Securities.............................................................................. 13
                  U.S. Government Obligations................................................................... 13

                                   ARTICLE II.
                                   SECURITIES

         SECTION 2.01.  Forms Generally......................................................................... 14
         SECTION 2.02.  Execution and Authentication............................................................ 14
         SECTION 2.03.  Form and Payment........................................................................ 15
         SECTION 2.04.  Legends................................................................................. 15
         SECTION 2.05.  Global Security......................................................................... 15
         SECTION 2.06.  Interest................................................................................ 17
         SECTION 2.07.  Transfer and Exchange................................................................... 18
         SECTION 2.08.  Replacement Securities.................................................................. 20
         SECTION 2.09.  Treasury Securities..................................................................... 21
         SECTION 2.10.  Temporary Securities.................................................................... 21
         SECTION 2.11.  Cancellation............................................................................ 22
         SECTION 2.12.  Defaulted Interest...................................................................... 22
         SECTION 2.13.  CUSIP Numbers........................................................................... 23






                                      iii




                           Table of Contents (cont'd)




                                  ARTICLE III.
                       PARTICULAR COVENANTS OF THE COMPANY

                                                                                                               Page
                                                                                                               ----
 
         SECTION 3.01.  Payment of Principal, Premium and
                        Interest................................................................................ 23
         SECTION 3.02.  Offices for Notices and Payments, etc................................................... 24
         SECTION 3.03.  Appointments to Fill Vacancies in
                        Trustee's Office........................................................................ 24
         SECTION 3.04.  Provision as to Paying Agent............................................................ 25
         SECTION 3.05.  Certificate to Trustee.................................................................. 26
         SECTION 3.06.  Compliance with Consolidation
                        Provisions.............................................................................. 26
         SECTION 3.07.  Limitation on Dividends................................................................. 26
         SECTION 3.08.  Covenants as to Markel Capital Trust.................................................... 27
         SECTION 3.09.  Payment of Expenses..................................................................... 28
         SECTION 3.10.  Payment Upon Resignation or Removal..................................................... 28

                                   ARTICLE IV.
                    SECURITYHOLDERS' LISTS AND REPORTS BY THE
                             COMPANY AND THE TRUSTEE

         SECTION 4.01.  Securityholders' Lists.................................................................. 29
         SECTION 4.02.  Preservation and Disclosure of Lists.................................................... 29
         SECTION 4.03.  Reports of the Company.................................................................. 31
         SECTION 4.04.  Reports by the Trustee.................................................................. 33


                                   ARTICLE V.
                   REMEDIES OF THE TRUSTEE AND SECURITYHOLDERS
                               ON EVENT OF DEFAULT

         SECTION 5.01.  Events of Default....................................................................... 33
         SECTION 5.02.  Payment of Securities on Default; Suit
                        Therefor................................................................................ 35
         SECTION 5.03.  Application of Moneys Collected by
                        Trustee................................................................................. 38
         SECTION 5.04.  Proceedings by Securityholders.......................................................... 38
         SECTION 5.05.  Proceedings by Trustee.................................................................. 39
         SECTION 5.06.  Remedies Cumulative and Continuing...................................................... 40


                                       iv



                           Table of Contents (cont'd)




                                                                                                               Page
                                                                                                               ----
 
         SECTION 5.07.  Direction of Proceedings and Waiver of
                        Defaults by Majority of
                        Securityholders......................................................................... 40
         SECTION 5.08.  Notice of Defaults...................................................................... 41
         SECTION 5.09.  Undertaking to Pay Costs................................................................ 42

                                   ARTICLE VI.
                             CONCERNING THE TRUSTEE

         SECTION 6.01.  Duties and Responsibilities of Trustee.................................................. 42
         SECTION 6.02.  Reliance on Documents, Opinions, etc.................................................... 44
         SECTION 6.03.  No Responsibility for Recitals, etc..................................................... 45
         SECTION 6.04.  Trustee, Authenticating Agent, Paying
                        Agents, Transfer Agents or Registrar May
                        Own Securities.......................................................................... 46
         SECTION 6.05.  Moneys to be Held in Trust.............................................................. 46
         SECTION 6.06.  Compensation and Expenses of Trustee.................................................... 46
         SECTION 6.07.  Officers' Certificate as Evidence....................................................... 47
         SECTION 6.08.  Conflicting Interest of Trustee......................................................... 47
         SECTION 6.09.  Eligibility of Trustee.................................................................. 47
         SECTION 6.10.  Resignation or Removal of Trustee....................................................... 48
         SECTION 6.11.  Acceptance by Successor Trustee......................................................... 50
         SECTION 6.12.  Successor by Merger, etc................................................................ 51
         SECTION 6.13.  Limitation on Rights of Trustee as a
                        Creditor................................................................................ 51
         SECTION 6.14.  Authenticating Agents................................................................... 51

                                  ARTICLE VII.
                         CONCERNING THE SECURITYHOLDERS

         SECTION 7.01.  Action by Securityholders............................................................... 53
         SECTION 7.02.  Proof of Execution by Securityholders................................................... 54
         SECTION 7.03.  Who Are Deemed Absolute Owners.......................................................... 54
         SECTION 7.04.  Securities Owned by Company Deemed Not
                        Outstanding............................................................................. 54
         SECTION 7.05.  Revocation of Consents; Future Holders
                        Bound................................................................................... 55



                                       v




                           Table of Contents (cont'd)



                                                                                                               Page
                                                                                                               ----

                                  ARTICLE VIII.
                            SECURITYHOLDERS' MEETINGS

 
         SECTION 8.01.  Purpose of Meetings..................................................................... 55
         SECTION 8.02.  Call of Meetings by Trustee............................................................. 56
         SECTION 8.03.  Call of Meetings by Company or
                        Securityholders......................................................................... 56
         SECTION 8.04.  Qualifications for Voting............................................................... 56
         SECTION 8.05.  Regulations............................................................................. 57
         SECTION 8.06.  Voting.................................................................................. 57

                                   ARTICLE IX.
                                   AMENDMENTS

         SECTION 9.01.  Without Consent of Securityholders...................................................... 58
         SECTION 9.02.  With Consent of Securityholders......................................................... 60
         SECTION 9.03.  Compliance with Trust Indenture Act;
                        Effect of Supplemental Indentures....................................................... 61
         SECTION 9.04.  Notation on Securities.................................................................. 61
         SECTION 9.05.  Evidence of Compliance of Supplemental
                        Indenture to be Furnished Trustee....................................................... 62

                                   ARTICLE X.
                CONSOLIDATION, MERGER, SALE, CONVEYANCE AND LEASE

         SECTION 10.01. Company May Consolidate, etc., on
                        Certain Terms........................................................................... 62
         SECTION 10.02. Successor Corporation to be Substituted
                        for Company............................................................................. 63
         SECTION 10.03. Opinion of Counsel to be Given Trustee.................................................. 63

                                   ARTICLE XI.
                     SATISFACTION AND DISCHARGE OF INDENTURE

         SECTION 11.01. Discharge of Indenture.................................................................. 64



                                       vi




                           Table of Contents (cont'd)


                                                                                                               Page
                                                                                                               ----

 
         SECTION 11.02.  Deposited Moneys and U.S. Government
                         Obligations to be Held in Trust by
                         Trustee................................................................................ 65
         SECTION 11.03.  Paying Agent to Repay Moneys Held...................................................... 65
         SECTION 11.04.  Return of Unclaimed Moneys............................................................. 65
         SECTION 11.05.  Defeasance Upon Deposit of Moneys or
                         U.S. Government Obligations........................................................... 65
         SECTION 11.06.  Reinstatement......................................................................... 67

                                   ARTICLE XII
                    IMMUNITY OF INCORPORATORS, STOCKHOLDERS,
                             OFFICERS AND DIRECTORS

         SECTION 12.01.  Indenture and Securities Solely Corporate
                         Obligations........................................................................... 68

                                  ARTICLE XIII.
                            MISCELLANEOUS PROVISIONS

         SECTION 13.01.  Successors............................................................................ 68
         SECTION 13.02.  Official Acts by Successor Corporation................................................ 68
         SECTION 13.03.  Surrender of Company Powers........................................................... 69
         SECTION 13.04.  Address for Notices, etc.............................................................. 69
         SECTION 13.05.  Governing Law......................................................................... 69
         SECTION 13.06.  Evidence of Compliance with
                         Conditions Precedent.................................................................. 69
         SECTION 13.07.  Business Days......................................................................... 70
         SECTION 13.08.  Trust Indenture Act to Control........................................................ 70
         SECTION 13.09.  Table of Contents, Headings, etc...................................................... 70
         SECTION 13.10.  Execution in Counterparts............................................................. 70
         SECTION 13.11.  Separability.......................................................................... 71
         SECTION 13.12.  Assignment............................................................................ 71
         SECTION 13.13.  Acknowledgement of Rights............................................................. 71


                                      vii


                           Table of Contents (cont'd)


                                                                                                               Page
                                                                                                               ----

                                  ARTICLE XIV.
                    PREPAYMENT OF SECURITIES -- MANDATORY AND
                              OPTIONAL SINKING FUND

 
         SECTION 14.01.  Special Event Prepayment.............................................................. 72
         SECTION 14.02.  Optional Prepayment by Company........................................................ 72
         SECTION 14.03.  No Sinking Fund....................................................................... 73
         SECTION 14.04.  Notice of Prepayment; Selection of
                         Securities............................................................................ 73
         SECTION 14.05.  Payment of Securities Called for
                         Prepayment............................................................................ 74
         SECTION 14.06.  Conditional Right to Advance Maturity................................................. 75

                                   ARTICLE XV.
                           SUBORDINATION OF SECURITIES

         SECTION 15.01.  Agreement to Subordinate.............................................................. 75
         SECTION 15.02.  Default on Senior Indebtedness........................................................ 76
         SECTION 15.03.  Liquidation; Dissolution; Bankruptcy.................................................. 77
         SECTION 15.04.  Subrogation........................................................................... 78
         SECTION 15.05.  Trustee to Effectuate Subordination................................................... 79
         SECTION 15.06.  Notice by the Company................................................................. 80
         SECTION 15.07.  Rights of the Trustee; Holders of Senior
                         Indebtedness.......................................................................... 81
         SECTION 15.08.  Subordination May Not Be Impaired..................................................... 82

                                  ARTICLE XVI.
                      EXTENSION OF INTEREST PAYMENT PERIOD

         SECTION 16.01.  Extension of Interest Payment Period.................................................. 82
         SECTION 16.02.  Notice of Extension................................................................... 83



                                      viii





                  THIS INDENTURE, dated as of January 13, 1997, between Markel
Corporation, a Virginia corporation (hereinafter sometimes called the
"Company"), and The Chase Manhattan Bank, a New York banking corporation, as
trustee (hereinafter sometimes called the "Trustee").

                              W I T N E S S E T H:

                  In consideration of the premises, and the purchase of the
Securities by the holders thereof, the Company covenants and agrees with the
Trustee for the equal and proportionate benefit of the respective holders from
time to time of the Securities, as follows:

                                   ARTICLE I.

                                  DEFINITIONS

                  SECTION 1.01.  Definitions.

                  The terms defined in this Section 1.01 (except as herein
otherwise expressly provided or unless the context otherwise requires) for all
purposes of this Indenture shall have the respective meanings specified in this
Section 1.01. All other terms used in this Indenture which are defined in the
Trust Indenture Act of 1939, or which are by reference therein defined in the
Securities Act, shall (except as herein otherwise expressly provided or unless
the context otherwise requires) have the meanings assigned to such terms in said
Trust Indenture Act and in said Securities Act as in force at the date of this
Indenture as originally executed. The following terms have the meanings given to
them in the Declaration: (i) Clearing Agency; (ii) Delaware Trustee; (iii)
Depository; (iv) Capital Security Certificate; (v) Property Trustee; (vi)
Administrative Trustees; (vii) Direct Action; (viii) Series A Capital
Securities; (ix) Series B Capital Securities; (x) Series A Capital Securities
Guarantee; and (x) Series B Capital Securities Guarantee. All accounting terms
used herein and not expressly defined shall have the meanings assigned to such
terms in accordance with generally accepted accounting principles and the term
"generally accepted accounting principles" means such accounting principles as
are



                                       1




generally accepted at the time of any computation. The words "herein", "hereof"
and "hereunder" and other words of similar import refer to this Indenture as a
whole and not to any particular Article, Section or other subdivision. Headings
are used for convenience of reference only and do not affect interpretation. The
singular includes the plural and vice versa.

                  "Additional Sums" shall have the meaning set forth in
Section 2.06(c).

                  "Adjusted Treasury Rate" shall mean, with respect to any
prepayment date, the rate per annum equal to the semi-annual equivalent yield to
maturity of the Comparable Treasury Issue, calculated using a price for the
Comparable Treasury Issue (expressed as a percentage of its principal amount)
equal to the Comparable Treasury Price for such prepayment date, in each case
calculated on the third Business Day preceding such prepayment date, plus in
each case (a) 1.25% if such prepayment date occurs on or prior to the first
anniversary of the Issue Date and (b) 0.50% in all other cases.

                  "Adverse Tax Consequence" shall have the meaning set forth in
the definition of Tax Event.

                  "Affiliate" shall mean, with respect to a specified Person,
(a) any Person directly or indirectly owning, controlling or holding the power
to vote 10% or more of the outstanding voting securities or other ownership
interests of the specified Person, (b) any Person 10% or more of whose
outstanding voting securities or other ownership interests are directly or
indirectly owned, controlled or held with power to vote by the specified Person,
(c) any Person directly or indirectly controlling, controlled by, or under
common control with the specified Person, (d) a partnership in which the
specified Person is a general partner, (e) any officer or director of the
specified Person, and (f) if the specified Person is an individual, any entity
of which the specified Person is an officer, director or general partner.




                                       2





                  "Authenticating Agent" shall mean any agent or agents of the
Trustee which at the time shall be appointed and acting pursuant to Section
6.14.

                  "Bankruptcy Law" shall mean Title 11, U.S. Code, or any
similar federal or state law for the relief of debtors.

                  "Board of Directors" shall mean either the Board of Directors
of the Company or any duly authorized committee of that board.

                  "Board Resolution" shall mean a copy of a resolution certified
by the Secretary or an Assistant Secretary of the Company to have been duly
adopted by the Board of Directors and to be in full force and effect on the date
of such certification, and delivered to the Trustee.

                  "Business Day" shall mean, with respect to any series of
Securities, any day other than a Saturday or a Sunday or a day on which banking
institutions in The City of New York are authorized or required by law or
executive order to close.

                  "Capital Leases" means, with respect to the Company and its
Subsidiaries, any lease of any property that should, in accordance with GAAP, be
classified and accounted for as a capital lease on a consolidated balance sheet
of the Company and its Subsidiaries.

                  "Capital Securities" shall mean undivided beneficial interests
in the assets of Markel Capital Trust which rank pari passu with the Common
Securities issued by Markel Capital Trust; provided, however, that if an Event
of Default has occurred and is continuing, no payments in respect of
Distributions on, or payments upon liquidation, redemption or otherwise with
respect to, the Common Securities shall be made until the holders of the Capital
Securities shall be paid in full the Distributions and the liquidation,
redemption and other payments to which they are entitled. References to "Capital
Securities" shall include collectively any Series A Capital Securities and
Series B Capital Securities.


                                       3




                  "Capital Securities Guarantee" shall mean any guarantee that
the Company may enter into with Markel Capital Trust or other Persons that
operate directly or indirectly for the benefit of holders of Capital Securities
of Markel Capital Trust and shall include a Series A Capital Securities
Guarantee and a Series B Capital Securities Guarantee with respect to the Series
A Capital Securities and the Series B Capital Securities, respectively.

                  "Commission" shall mean the Securities and Exchange
Commission, as from time to time constituted, created under the Exchange Act, or
if at any time after the execution of this Indenture such Commission is not
existing and performing the duties now assigned to it under the Trust Indenture
Act of 1939, then the body performing such duties at such time.

                  "Common Securities" shall mean undivided beneficial interests
in the assets of Markel Capital Trust which rank pari passu with Capital
Securities issued by Markel Capital Trust; provided, however, that if an Event
of Default has occurred and is continuing, no payments in respect of
Distributions on, or payments upon liquidation, redemption or otherwise with
respect to, the Common Securities shall be made until the holders of the Capital
Securities shall be paid in full the Distributions and the liquidation,
redemption and other payments to which they are entitled.

                  "Common Securities Guarantee" shall mean any guarantee that
the Company may enter into with any Person or Persons that operate directly or
indirectly for the benefit of holders of Common Securities of Markel Capital
Trust.

                  "Common Stock" shall mean the Common Stock, no par value, of
the Company or any other class of stock resulting from changes or
reclassifications of such Common Stock consisting solely of changes in par
value, or from par value to no par value, or from no par value to par value.

                  "Company" shall mean Markel Corporation, a Virginia
corporation, and, subject to the provisions of Article X, shall include its
successors and assigns.



                                       4





                  "Company Request" or "Company Order" shall mean a written
request or order signed in the name of the Company by the Chairman, the Chief
Executive Officer, the President, a Vice Chairman, a Vice President, the
Controller, the Secretary or an Assistant Secretary of the Company, and
delivered to the Trustee.

                  "Comparable Treasury Issue" shall mean the United States
Treasury security selected by the Quotation Agent as having a maturity
comparable to the remaining term to the Stated Maturity Date of the Securities
that would be utilized, at the time of selection and in accordance with
customary financial practice, in pricing new issues of corporate debt securities
of comparable maturity to the remaining term of the Securities.

                  "Comparable Treasury Price" shall mean, with respect to any
prepayment date pursuant to Section 14.01, (i) the average of the bid and asked
prices for the Comparable Treasury Issue (expressed in each case as a percentage
of its principal amount) on the third Business Day preceding such prepayment
date, as set forth in the daily statistical release (or any successor release)
published by the Federal Reserve Bank of New York and designated "Composite 3:30
p.m. Quotations for U.S. Government Securities" or (ii) if such release (or any
successor release) is not published or does not contain such prices on such
Business Day, (A) the average of five Reference Treasury Dealer Quotations for
such prepayment date, after excluding the highest and lowest such Reference
Treasury Dealer Quotations, or (B) if the Trustee obtains fewer than three such
Reference Treasury Dealer Quotations, the average of all such Quotations.

                  "Compounded Interest" shall have the meaning set forth in
Section 16.01.

                  "Conditional Tax Redemption Event" shall have the meaning set
forth in Section 14.06.

                  "Contingent Obligation" means, with respect to the Company and
its Subsidiaries, without duplication, any obligation, contingent or otherwise,
of any such Person pursuant to which such Person has directly or indirectly
guaranteed any debt or other obligation of any other Person and, without



                                       5





limiting the generality of the foregoing, any obligation, direct or indirect,
contingent or otherwise, of any such Person (a) to purchase or pay (or advance
or supply funds for the purchase or payment of) such debt or other obligation
(whether arising by virtue of partnership arrangements, by agreement to keep
well, to purchase assets, goods, securities or services, to take or pay, or to
maintain financial statement condition or otherwise) or (b) entered into for the
purpose of assuring in any other manner the obligee of such debt or other
obligation of the payment thereof or to protect such obligee against loss in
respect thereof (in whole or in part); provided, that the term Contingent
Obligation shall not include (i) obligations under insurance or reinsurance
policies, or (ii) endorsements for collection or deposit in the ordinary course
of business.

                  "Credit Agreement" shall mean the Credit Agreement dated as of
December 18, 1996 by and among the Company, the lenders referred to therein and
First Union National Bank of North Carolina, as Agent.

                  "Custodian" shall mean any receiver, trustee, assignee,
liquidator, or similar official under any Bankruptcy Law.

                  "Declaration" shall mean the Amended and Restated Declaration
of Trust of Markel Capital Trust, dated as of January 13, 1997.

                  "Default" shall mean any event, act or condition that with
notice or lapse of time, or both, would constitute an Event of Default.

                   "Deferred Interest" shall have the meaning set forth
in Section 16.01.

                  "Definitive Securities" shall mean those securities issued in
fully registered certificated form not otherwise in global form.

                  "Depositary" shall mean, with respect to Securities of any
series, for which the Company shall determine that such Securities will be
issued as a Global Security, The Depository Trust Company, New York, New York,
another clearing agency, or any successor registered as a clearing agency under
the Exchange Act or other applicable statute or regulation, which, in each case,
shall be designated by the Company pursuant to Section 2.05(d).



                                       6





                  "Dissolution Event" shall mean the liquidation of the Trust
pursuant to the Declaration, and the distribution of the Securities held by the
Property Trustee to the holders of the Trust Securities issued by the Markel
Capital Trust pro rata in accordance with the Declaration.

                  "Event of Default" shall mean any event specified in Section
5.01, continued for the period of time, if any, and after the giving of the
notice, if any, therein designated.

                  "Exchange Act" shall mean the Securities Exchange Act
of 1934, as amended.

                  "Exchange Offer" shall mean the exchange offer (including any
private exchange offer) contemplated in Section 2(a) of the Registration Rights
Agreement.

                  "Extended Interest Payment Period" shall have the meaning set
forth in Section 16.01.

                  "GAAP" means generally accepted accounting principles, as
recognized by the American Institute of Certificated Public Accountants and the
Financial Accounting Standards Board, consistently applied and maintained on a
consistent basis for the Company and its Subsidiaries throughout the period
indicated and consistent with the prior financial practice of the Company and
its Subsidiaries.

                  "Global Security" shall mean, with respect to the Securities,
a Security executed by the Company and delivered by the Trustee to the
Depositary or pursuant to the Depositary's instruction, all in accordance with
the Indenture, which shall be registered in the name of the Depositary or its
nominee.




                                       7





                  "Guarantees"  shall mean, collectively, the Series A
Capital Securities Guarantee, the Series B Capital Securities Guarantee and the
Common Securities Guarantee.

                  "Hedging Agreement" means any agreement with respect to an
interest rate swap, collar, cap, floor or a forward rate agreement or other
agreement regarding the hedging of interest rate risk exposure executed in
connection with hedging the interest rate exposure of the Company under the
Credit Agreement and any confirming letter executed pursuant to such hedging
agreement, all as amended or modified from time to time.

                  "Indebtedness for Money Borrowed" shall mean any obligation
of, or any obligation guaranteed by, the Company for the repayment of borrowed
money, whether or not evidenced by bonds, debentures, notes or other written
instruments.

                  "Indenture" shall mean this instrument as originally executed
or, if amended as herein provided, as so amended.

                  "Initial Optional Prepayment Date" shall mean January
1, 2007.

                  "Interest Payment Date" shall have the meaning set
forth in Section 2.06.

                  "Investment Company Event" shall mean that Markel Capital
Trust and the Company shall have received an opinion, requested by the Company,
of counsel experienced in practice under the Investment Company Act of 1940, as
amended (the "1940 Act"), to the effect that, as a result of the occurrence of a
change in law or regulation or a change in interpretation or application of law
or regulation by any legislative body, court, governmental agency or regulatory
authority (a "Change in 1940 Act Law"), there is more than an insubstantial risk
that Markel Capital Trust is or will be considered an "investment company" which
is required to be registered under the 1940 Act, which Change in 1940 Act Law
becomes effective on or after the Issue Date.

                  "Issue Date" shall mean January 13, 1997.


                                       8





                  "Lien" means, with respect to any asset, any Mortgage, lien,
pledge, charge, security interest or encumbrance of any kind with respect to
such asset. For the purposes of this Indenture, a Person shall be deemed to own
subject to a Lien any asset which it has acquired or holds subject to the
interest of a vendor or lessor under any conditional sale agreement, Capital
Lease or other title retention agreement relating to such asset.

                  "Liquidated Damages" shall have the meaning set forth
in the Registration Rights Agreement.

                  "Markel Capital Trust" shall mean Markel Capital Trust I, a
Delaware business trust created for the purpose of issuing its undivided
beneficial interests in connection with the issuance of Securities under this
Indenture.

                  "Maturity Date" shall mean January 1, 2046, or such other date
to which the maturity of the Securities is changed pursuant to the right of the
Company to advance the maturity date pursuant to the provisions of Section
14.06.

                   "Mortgage" shall mean and include any mortgage, pledge, lien,
security interest, conditional sale or other title retention agreement or other
similar encumbrance.

                   "Non Book-Entry Capital Securities" shall have the meaning
set forth in Section 2.05.

                  "Officers" shall mean any of the Chairman, a Vice Chairman,
the Chief Executive Officer, the President, a Vice President, the Controller,
the Secretary or an Assistant Secretary, the Treasurer or an Assistant Treasurer
of the Company.

                  "Officers' Certificate" shall mean a certificate signed
by two Officers and delivered to the Trustee.

                  "Opinion of Counsel" shall mean a written opinion of counsel,
who may be an employee of the Company, and who shall be acceptable to the
Trustee.





                                       9





                  "Optional Prepayment Price" shall have the meaning set
forth in Section 14.02.

                  "Other Debentures" shall mean all junior subordinated
debentures issued by the Company from time to time and sold to trusts to be
established by the Company (if any), in each case similar to Markel Capital
Trust.

                  "Other Guarantees" shall mean all guarantees to be issued by
the Company with respect to capital securities (if any) and issued to other
trusts to be established by the Company (if any), in each case similar to the
Markel Capital Trust.

                  The term "outstanding" when used with reference to Securities,
shall, subject to the provisions of Section 7.04, mean, as of any particular
time, all Securities authenticated and delivered by the Trustee or an
Authenticating Agent under this Indenture, except

                  (a)      Securities theretofore cancelled by the Trustee or
                           an Authenticating Agent or delivered to the
                           Trustee for cancellation;

                  (b)      Securities, or portions thereof, for the payment
                           or prepayment of which moneys in the necessary
                           amount shall have been deposited in trust with the
                           Trustee or with any paying agent (other than the
                           Company) or shall have been set aside and
                           segregated in trust by the Company (if the Company
                           shall act as its own paying agent); provided that,
                           if such Securities, or portions thereof, are to be
                           prepaid prior to maturity thereof, notice of such
                           prepayment shall have been given as in Article XIV
                           provided or provision satisfactory to the Trustee
                           shall have been made for giving such notice; and

                  (c)      Securities in lieu of or in substitution for which
                           other Securities shall have been authenticated and
                           delivered pursuant to the terms of Section 2.08
                           unless proof satisfactory to the Company and the
                           Trustee is presented that any such Securities are
                           held by bona fide holders in due course.


                                       10




                  "Person" shall mean a legal person, including any individual,
corporation, estate, partnership, joint venture, association, joint stock
company, limited liability company, trust, unincorporated association, or
government or any agency or political subdivision thereof, or any other entity
of whatever nature.

                  "Predecessor Security" of any particular Security shall mean
every previous Security evidencing all or a portion of the same debt as that
evidenced by such particular Security; and, for the purposes of this definition,
any Security authenticated and delivered under Section 2.08 in lieu of a lost,
destroyed or stolen Security shall be deemed to evidence the same debt as the
lost, destroyed or stolen Security.

                  "Prepayment Price" shall mean the Special Event
Prepayment Price or the Optional Prepayment Price, as the context
requires.

                  "Principal office of the Trustee", or other similar term,
shall mean the principal office of the Trustee, at which at any particular time
its corporate trust business shall be administered.

                  "Property Trustee" shall have the same meaning as set
forth in the Declaration.

                  "Purchase Agreement" shall mean the Purchase Agreement,
dated January 8, 1997, among the Company, Markel Capital Trust
and the initial purchasers named therein.

                  "Qualified Debt Obligations" means, without duplication, (a)
debt securities of the Company, provided that the terms of any such debt
security (i) permit the deferral of principal and interest payments for a period
of up to five years (but not beyond the maturity date), as elected by the
Company, (ii) have a maturity for payment of principal of not less than ten (10)
years after the date of issuance, and (iii) include





                                       11





provisions making the debt security expressly subordinate to all other debt of
the Company, (b) preferred securities issued by a Subsidiary, the sole purpose
of which is to issue such preferred securities and invest the proceeds thereof
in debt securities of the type described in clause (a) above, and which
preferred securities are payable solely out of the proceeds of payments on
account of such debt securities; and (c) the obligations recorded on the
consolidated balance sheet of the Company and its Subsidiaries with respect to
debt securities of the type described in clause (a) above and preferred
securities of the type described in clause (b) above.

                  "Quotation Agent" shall mean the Reference Treasury
Dealer appointed by the Company.

                  "Reference Treasury Dealer" shall mean (i) Donaldson, Lufkin &
Jenrette Securities Corporation, and its successors; provided, however, that if
the foregoing shall cease to be a primary U.S. Government securities dealer in
New York City (a "Primary Treasury Dealer"), the Company shall substitute
therefor another Primary Treasury Dealer, and (ii) any other Primary Treasury
Dealer selected by the Trustee after consultation with the Company.

                  "Reference Treasury Dealer Quotations" shall mean, with
respect to each Reference Treasury Dealer and any prepayment date pursuant to
Section 14.01, the average, as determined by the Trustee, of the bid and asked
prices for the Comparable Treasury Issue (expressed in each case as a percentage
of its principal amount) at 5:00 p.m. New York City time on the third Business
Day preceding such prepayment date, quoted in writing to the Trustee by such
Reference Treasury Dealer.

                  "Registration Rights Agreement" shall mean the Registration
Rights Agreement, dated as of January 13, 1997 by and among the Company, Markel
Capital Trust and the initial purchasers named therein as such agreement may be
amended, modified or supplemented from time to time.


                                       12





                  "Responsible Officer", when used with respect to the Trustee,
shall mean any officer of the Trustee with responsibility for the administration
of this Indenture and also means, with respect to a particular corporate trust
matter, any other officer to whom such matter is referred because of his
knowledge of and familiarity with the particular subject.

                  "Restricted Security" shall mean Securities that bear or are
required to bear the legends set forth in Exhibit A hereto, other than those
legends to be set forth only on a Global Security.

                  "Rule 144A" shall mean Rule 144A under the Securities Act, as
such Rule may be amended from time to time, or under any similar rule or
regulation hereafter adopted by the Commission.

                  "Securities" shall mean, collectively, the Series A Securities
and the Series B Securities.

                  "Securities Act" shall mean the Securities Act of 1933,
as amended.

                  "Securityholder", "holder of Securities", or other similar
terms, shall mean any Person in whose name at the time a particular Security is
registered on the register kept by the Company or the Trustee for that purpose
in accordance with the terms hereof.

                  "Security Register" shall mean (i) prior to a Dissolution
Event, the list of holders provided to the Trustee pursuant to Section 4.01, and
(ii) following a Dissolution Event, any security register maintained by a
security registrar for the securities appointed by the Company following the
execution of a supplemental indenture providing for transfer procedures as
provided for in Section 2.07(a).

                  "Senior Indebtedness" shall mean with respect to the Company
and its Subsidiaries: (a) all liabilities, obligations and indebtedness for
borrowed money, whether or not evidenced by bonds, debentures, notes or other
similar instruments, (b) all obligations to pay the deferred purchase price of
property or services (other than trade payables due and arising in the ordinary
course of business), (c) all Capital Lease Obligations,





                                       13





(d) all debt of any other Person secured by a Lien on any asset of the Company
or any of its Subsidiaries, (e) all Contingent Obligations, (f) all obligations,
contingent or otherwise, relating to the face amount of letters of credit,
whether or not drawn, and banker's acceptance, but excluding any obligation
relating to an undrawn letter of credit if the undrawn letter of credit is
issued in connection with a liability for which a reserve has been established
by the Company or the applicable Subsidiary in accordance with GAAP, and (g) all
obligations incurred pursuant to Hedging Agreements which are due and payable;
provided, that Senior Indebtedness shall not include the Securities, the
Guarantees or other Qualified Debt Obligations.

                  "Series A Securities" means the Company's 8.71% Series A
Junior Subordinated Deferrable Interest Debentures due January 1, 2046, as
authenticated and issued under this Indenture.

                  "Series B Securities" means the Company's Series B 8.71%
Junior Subordinated Deferrable Interest Debentures due January 1, 2046, as
authenticated and issued under this Indenture.

                  "Special Event" means either a Conditional Tax Redemption
Event or an Investment Company Event.

                  "Special Event Prepayment Price" shall mean, with respect to
any prepayment of the Securities pursuant to Section 14.01 hereof, an amount in
cash equal to the greater of (i) 100% of the principal amount of the Securities
to be prepaid and (ii) the sum, as determined by a Quotation Agent, of the
present values of the principal amount and premium payable as part of the
Optional Prepayment Price with respect to an optional prepayment of such
Securities pursuant to Section 14.02 on the Initial Optional Prepayment Date
together with scheduled payments of interest on the Securities from the
prepayment date to and including the Initial Optional Prepayment Date discounted
to the prepayment date on a semi-annual basis (assuming a 360-day year
consisting of twelve 30-day months) at the Adjusted Treasury Rate, plus, in each
case, accrued and unpaid interest thereon, including Compounded Interest and
Additional Sums, if any, to the date of such prepayment.





                                       14





                  "Subsidiary" shall mean with respect to any Person, (i) any
corporation at least a majority of whose outstanding voting stock of which is
owned, directly or indirectly, by such Person or by one or more of its
Subsidiaries, or by such Person and one or more of its Subsidiaries, (ii) any
general partnership, joint venture or similar entity, at least a majority of
whose outstanding partnership or similar interests shall at the time be owned by
such Person, or by one or more of its Subsidiaries, or by such Person and one or
more of its Subsidiaries and (iii) any limited partnership of which such Person
or any of its Subsidiaries is a general partner. For the purposes of this
definition, "voting stock" means shares, interests, participations or other
equivalents in the equity interest (however designated) in such Person having
ordinary voting power for the election of a majority of the directors (or the
equivalent) of such Person, other than shares, interests, participations or
other equivalents having such power only by reason of the occurrence of a
contingency.

                  "Tax Event" shall mean the receipt by Markel Capital Trust and
the Company of an opinion, requested by the Company, of counsel experienced in
such matters to the effect that, as a result of any amendment to, or change
(including any announced prospective change) in, the laws or any regulations
thereunder of the United States or any political subdivision or taxing authority
thereof or therein or as a result of any official administrative written
decision or pronouncement or judicial decision interpreting or applying such
laws or regulations, which amendment or change is effective or which
pronouncement or decision is made on or after the Issue Date, there is more than
an insubstantial risk that (i) Markel Capital Trust is, or will be within 90
days of the date of such opinion, subject to United States Federal income tax
with respect to income received or accrued on the Securities, (ii) interest
payable by the Company on the Securities is not, or within 90 days of the date
of such opinion, will not be, deductible by the Company, in whole or in part,
for United States Federal income tax purposes, or (iii) Market Capital Trust is,
or will be within 90 days of the date of such opinion, subject to more than a de
minimis amount of other taxes, duties or other governmental charges (each of the
circumstances referred to in clauses (i), (ii) and (iii) being referred to
herein as an "Adverse Tax Consequence").


                                       15






                  "Tax Event Maturity Advancement" shall have the meaning
specified in Section 14.06.

                  "Trustee" shall mean the Person identified as "Trustee" in the
first paragraph hereof, and, subject to the provisions of Article VI hereof,
shall also include its successors and assigns as Trustee hereunder.

                  "Trust Indenture Act of 1939" shall mean the Trust Indenture
Act of 1939 as in force at the date of execution of this Indenture except as
provided in Section 9.03; provided, however, that, in the event the Trust
Indenture Act of 1939 is amended after such date, "Trust Indenture Act of 1939"
shall mean, to the extent required by any such amendment, the Trust Indenture
Act of 1939 as so amended.

                  "Trust Securities" shall mean the Capital Securities and the
Common Securities, collectively.

                  "U.S. Government Obligations" shall mean securities that are
(i) direct obligations of the United States of America for the payment of which
its full faith and credit is pledged or (ii) obligations of a Person controlled
or supervised by and acting as an agency or instrumentality of the United States
of America the payment of which is unconditionally guaranteed as a full faith
and credit obligation by the United States of America, which, in either case
under clauses (i) or (ii) are not callable or redeemable at the option of the
issuer thereof, and shall also include a depository receipt issued by a bank or
trust company as custodian with respect to any such U.S. Government Obligation
or a specific payment of interest on or principal of any such U.S. Government
Obligation held by such custodian for the account of the holder of a depository
receipt, provided that (except as required by law) such custodian is not
authorized to make any deduction from the amount payable to the holder of such
depository receipt from any amount received by the custodian in respect of the
U.S. Government Obligation or the specific payment of interest on or principal
of the U.S. Government Obligation evidenced by such depository receipt.





                                       16





                                   ARTICLE II.

                                   SECURITIES

                  SECTION 2.01.  Forms Generally.

                  The Securities and the Trustee's certificate of authentication
shall be substantially in the form of Exhibit A, the terms of which are
incorporated in and made a part of this Indenture. The Securities may have
notations, legends or endorsements required by law, stock exchange rule,
agreements to which the Company is subject or usage. Each Security shall be
dated the date of its authentication. The Securities shall be issued in
denominations of $1,000 and integral multiples thereof.

                  SECTION 2.02.  Execution and Authentication.

                  The Securities shall be signed on behalf of the Company by the
Chairman, a Vice Chairman, the Chief Executive Officer, the President, a Vice
President or the Controller and attested by its Secretary or an Assistant
Secretary. Any signature may be in the form of a manual or facsimile signature.
If an Officer whose signature is on a Security no longer holds that office at
the time the Security is authenticated, the Security shall nevertheless be
valid.

                  A Security shall not be valid until authenticated by the
manual signature of the Trustee. The signature of the Trustee shall be
conclusive evidence that the Security has been authenticated under this
Indenture. The form of Trustee's certificate of authentication to be borne by
the Securities shall be substantially as set forth in Exhibit A hereto.

                  The Trustee shall, upon a Company Order, authenticate for
original issue up to, and the aggregate principal amount of Securities
outstanding at any time may not exceed, $154,640,000 aggregate principal amount
of the Securities; except as provided in Sections 2.07, 2.08, 2.10 and 14.05.


                                       17



                  SECTION 2.03.  Form and Payment.

                  Except as provided in Section 2.05, the Securities shall be
issued in fully registered certificated form without interest coupons. Principal
of and premium, if any, and interest on the Securities issued in certificated
form will be payable, the transfer of such Securities will be registrable and
such Securities will be exchangeable for Securities bearing identical terms and
provisions at the office or agency of the Trustee; provided, however, that
payment of interest with respect to the Securities (other than Securities issued
in global form, the payment of interest on which shall be made in immediately
available funds) may be made at the option of the Company (i) by check mailed to
the holder at such address as shall appear in the Security Register or (ii) by
transfer to an account maintained by the Person entitled thereto, provided that
proper transfer instructions have been received in writing by the relevant
record date. Notwithstanding the foregoing, so long as the holder of any
Securities is the Property Trustee, the payment of the principal of and premium,
if any, and interest (including Compounded Interest and Additional Sums, if any)
on such Securities held by the Property Trustee will be made in immediately
available funds at such place and to such account as may be designated by the
Property Trustee.

                  SECTION 2.04.  Legends.

                  (a) Except as permitted by subsection (b) of this Section 2.04
or as otherwise determined by the Company in accordance with applicable law,
each Security shall bear the applicable legends relating to restrictions on
transfer pursuant to the securities laws in substantially the form set forth on
Exhibit A hereto.

                  (b) The Company shall issue and the Trustee shall authenticate
Series B Securities in exchange for Series A Securities accepted for exchange in
the Exchange Offer, which Series B Securities shall not bear the legends


                                       18




required by subsection (a) above, in each case unless the Trustee is notified in
writing by the Company that the holder of such Series A Securities is either (A)
a broker-dealer who purchased such Series A Securities directly from the Company
for resale pursuant to Rule 144A or any other available exemption under the
Securities Act, (B) a Person participating in the distribution of the Series A
Securities or (C) a Person who is an affiliate (as defined in Rule 144 under the
Securities Act) of the Company.

                  SECTION 2.05.  Global Security.

                  (a)      In connection with a Dissolution Event,


                                  (i)       if any Capital Securities are held
         in book-entry form, the related Definitive Securities shall be
         presented to the Trustee (if an arrangement with the Depositary has
         been maintained) by the Property Trustee in exchange for one or more
         Global Securities (as may be required pursuant to Section 2.07) in an
         aggregate principal amount equal to the aggregate principal amount of
         all outstanding Securities, to be registered in the name of the
         Depositary, or a custodian therefor, or its nominee, and delivered by
         the Trustee to the Depositary for crediting to the accounts of its
         participants pursuant to the instructions of the Administrative
         Trustees; the Company upon any such presentation shall execute one or
         more Global Securities in such aggregate principal amount and deliver
         the same to the Trustee for authentication and delivery in accordance
         with this Indenture; and payments on the Securities issued as a Global
         Security will be made to the Depositary; and

                                 (ii)       if any Capital Securities are held
         in certificated form, the related Definitive Securities may be
         presented to the Trustee by the Property Trustee and any Capital
         Security certificate which represents Capital Securities other than
         Capital Securities in book-entry form ("Non Book-Entry Capital
         Securities") will be deemed to represent beneficial interests in
         Securities presented to the Trustee by the Property Trustee having an
         aggregate principal amount equal to the aggregate liquidation amount of



                                       19




         the Non Book-Entry Capital Securities until such Capital Security
         certificates are presented to the Security Registrar for transfer or
         reissuance, at which time such Capital Security certificates will be
         cancelled and a Security, registered in the name of the holder of the
         Capital Security certificate, with an aggregate principal amount equal
         to the aggregate liquidation amount of the Capital Security certificate
         cancelled, will be executed by the Company and delivered to the Trustee
         for authentication and delivery in accordance with this Indenture. Upon
         the issuance of such Securities, Securities with an equivalent
         aggregate principal amount that were presented by the Property Trustee
         to the Trustee will be deemed to have been cancelled.

                  (b) The Global Securities shall represent the aggregate amount
of outstanding Securities from time to time endorsed thereon; provided, that the
aggregate amount of outstanding Securities represented thereby may from time to
time be reduced or increased, as appropriate, to reflect exchanges and
prepayments. Any endorsement of a Global Security to reflect the amount of any
increase or decrease in the amount of outstanding Securities represented thereby
shall be made by the Trustee, in accordance with instructions given by the
Company as required by this Section 2.05.

                  (c) The Global Securities may be transferred, in whole but not
in part, only to another nominee of the Depositary, or to a successor Depositary
selected or approved by the Company or to a nominee of such successor
Depositary.

                  (d) If at any time the Depositary notifies the Company that it
is unwilling or unable to continue as Depositary or the Depositary has ceased to
be a clearing agency registered under the Exchange Act, and a successor
Depositary is not appointed by the Company within 90 days after the Company
receives such notice or becomes aware of such condition, as the case may be, the
Company will execute, and the Trustee, upon receipt of a Company Order, will
authenticate and make available for delivery the Definitive Securities, in
authorized denominations, and in an aggregate principal amount equal to the
principal amount of the


                                       20





Global Security in exchange for such Global Security. If there is an Event of
Default, the Depositary shall have the right to exchange the Global Securities
for Definitive Securities. In addition, the Company may at any time determine
that the Securities shall no longer be represented by a Global Security. In the
event of such an Event of Default or such a determination, the Company shall
execute, and subject to Section 2.07, the Trustee, upon receipt of an Officers'
Certificate evidencing such determination by the Company, will authenticate and
make available for delivery the Definitive Securities, in authorized
denominations, and in an aggregate principal amount equal to the principal
amount of the Global Security in exchange for such Global Security. Upon the
exchange of the Global Security for such Definitive Securities, in authorized
denominations, the Global Security shall be cancelled by the Trustee. Such
Definitive Securities issued in exchange for the Global Security shall be
registered in such names and in such authorized denominations as the Depositary,
pursuant to instructions from its direct or indirect participants or otherwise,
shall instruct the Trustee. The Trustee shall deliver such Definitive Securities
to the Depositary for delivery to the Persons in whose names such Definitive
Securities are so registered.

                  SECTION 2.06.  Interest.

                  (a) Each Security will bear interest at the rate of 8.71% per
annum (the "Coupon Rate") from the most recent date to which interest has been
paid or, if no interest has been paid, from January 13, 1997, until the
principal thereof becomes due and payable, and on any overdue principal and (to
the extent that payment of such interest is enforceable under applicable law) on
any overdue installment of interest at the Coupon Rate, compounded
semi-annually, payable (subject to the provisions of Article XVI) semi-annually
in arrears on January 1 and July 1 of each year (each, an "Interest Payment
Date") commencing on July 1, 1997 to the Person in whose name such Security or
any predecessor Security is registered, at the close of business on the regular
record date for such interest installment, which shall be the date fifteen days
prior to the relevant Interest Payment Date.


                                       21



                  (b) Interest will be computed on the basis of a 360-day year
consisting of twelve 30-day months and, for any period of less than a full
calendar month, the number of days elapsed in such month. In the event that any
Interest Payment Date falls on a day that is not a Business Day, then payment of
interest payable on such date will be made on the next succeeding day which is a
Business Day (and without any interest or other payment in respect of any such
delay), with the same force and effect as if made on such date.

                  (c) During such time as the Property Trustee is the holder of
any Securities, the Company shall pay any additional amounts on the Securities
as may be necessary in order that the amount of Distributions then due and
payable by Markel Capital Trust on the outstanding Trust Securities shall not be
reduced as a result of any additional taxes, duties and other governmental
charges to which Markel Capital Trust has become subject as a result of a Tax
Event ("Additional Sums").

                  SECTION 2.07.  Transfer and Exchange.

                  (a) Transfer Restrictions. The Series A Securities, and those
Series B Securities with respect to which any Person described in Section
2.04(b)(A), (B) or (C) is the beneficial owner, may not be transferred except in
compliance with any legend contained in Exhibit A unless otherwise determined by
the Company in accordance with applicable law. Until the Securities are
registered under the Securities Act, the Securities may be transferred only in
blocks having an aggregate principal amount of not less than $100,000. Any such
transfer of the Securities in a block having an aggregate principal amount of
less than $100,000 shall be deemed to be void and of no legal effect whatsoever.
Any such transferee shall be deemed not to be holder of such Securities for any
purpose, including but not limited to the receipt of payments on such
Securities, and such transferee shall be deemed to have no interest whatsoever
in such Securities. Upon any distribution of the Securities following a
Dissolution Event, the Company and the Trustee shall enter into a supplemental
indenture pursuant to Section 9.01 to provide for the transfer restrictions and
procedures with respect to the Securities substantially similar to those
contained in the Declaration to the extent applicable in the circumstances
existing at such time.

                                       22



                  (b) General Provisions Relating to Transfers and Exchanges. To
permit registrations of transfers and exchanges, the Company shall execute and
the Trustee shall authenticate Definitive Securities and Global Securities. All
Definitive Securities and Global Securities issued upon any registration of
transfer or exchange of Definitive Securities or Global Securities shall be the
valid obligations of the Company, evidencing the same debt, and entitled to the
same benefits under this Indenture, as the Definitive Securities or Global
Securities surrendered upon such registration of transfer or exchange.

                  No service charge shall be made to a holder for any
registration of transfer or exchange, but the Company may require payment of a
sum sufficient to cover any transfer tax or similar governmental charge payable
in connection therewith.

                  The Company shall not be required to (i) issue, register the
transfer of or exchange Securities during a period beginning at the opening of
business 15 days before the day of mailing of a notice of prepayment or any
notice of selection of Securities for prepayment under Article XIV hereof and
ending at the close of business on the day of such mailing; or (ii) register the
transfer of or exchange any Security so selected for prepayment in whole or in
part, except the unprepaid portion of any Security being prepaid in part.

                  Prior to due presentment for the registration of a transfer of
any Security, the Trustee, any agent and the Company may deem and treat the
Person in whose name any Security is registered as the absolute owner of such
Security for the purpose of receiving payment of principal of and premium, if
any, and interest on such Securities, and neither the Trustee, any agent nor the
Company shall be affected by notice to the contrary.

                  (c)      Exchange of Series A Securities for Series B
Securities.  The Series A Securities may be exchanged for Series B Securities
pursuant to the terms of the Exchange Offer.  The Trustee shall make the
exchange as follows:

                                       23




                  The Company shall present the Trustee with an Officers'
Certificate certifying the following:

                  (A)      upon issuance of the Series B Securities, the
                           transactions contemplated by the Exchange Offer have
                           been consummated: and

                  (B)      the principal amount of Series A Securities properly
                           tendered in the Exchange Offer that are represented
                           by a Global Security and the principal amount of
                           Series A Securities properly tendered in the Exchange
                           Offer that are represented by Definitive Securities,
                           the name of each holder of such Definitive
                           Securities, the principal amount at maturity properly
                           tendered in the Exchange Offer by each such holder
                           and the name and address to which Definitive
                           Securities for Series B Securities shall be
                           registered and sent for each such holder.

                  The Trustee, upon receipt of (i) such Officers' Certificate,
(ii) an Opinion of Counsel (x) to the effect that the Series B Securities have
been registered under Section 5 of the Securities Act and the Indenture has been
qualified under the Trust Indenture Act of 1939 and (y) with respect to the
matters set forth in Section 3(p) of the Registration Rights Agreement and (iii)
a Company Order, shall authenticate (A) a Global Security for Series B
Securities in aggregate principal amount equal to the aggregate principal amount
of Series A Securities represented by a Global Security indicated in such
Officers' Certificate as having been properly tendered and (B) Definitive
Securities representing Series B Securities registered in the names of, and in
the principal amounts indicated in, such Officers' Certificate.

                  If the principal amount at maturity of the Global Security for
the Series B Securities is less than the principal amount at maturity of the
Global Security for the Series A Securities, the Trustee shall make an
endorsement on such Global Security for the Series A Securities indicating a
reduction in the principal amount at maturity represented thereby.


                                       24




                  The Trustee shall deliver such Definitive Securities for
Series B Securities to the holders thereof as indicated in such Officers'
Certificate.

                  SECTION 2.08.  Replacement Securities.

                  If any mutilated Security is surrendered to the Trustee, or
the Company and the Trustee receive evidence to their satisfaction of the
destruction, loss or theft of any Security, the Company shall issue and the
Trustee shall authenticate a replacement Security if the Trustee's requirements
for replacements of Securities are met. An indemnity bond must be supplied by
the holder that is sufficient in the judgment of the Trustee and the Company to
protect the Company, the Trustee and any authenticating agent from any loss that
any of them may suffer if a Security is replaced.  The Company or the Trustee
may charge for its expenses in replacing a Security.

                  Every replacement Security is an obligation of the Company and
shall be entitled to all of the benefits of this Indenture equally and
proportionately with all other Securities duly issued hereunder.

                  SECTION 2.09.  Treasury Securities.

                  In determining whether the holders of the required principal
amount of Securities have concurred in any direction, waiver or consent,
Securities owned by the Company or any Affiliate of the Company shall be
considered as though not outstanding, except that for purposes of determining
whether the Trustee shall be protected in relying on any such direction, waiver
or consent, only Securities that a Responsible Officer of the Trustee actually
knows to be so owned shall be so considered.

                  SECTION 2.10.  Temporary Securities.

                  Pending the preparation of Definitive Securities, the Company
may execute, and upon Company Order the Trustee shall authenticate and make
available for delivery, temporary Securities that are printed, typewritten,
lithographed, mimeographed or otherwise reproduced, in any authorized
denomination, substantially of the tenor of the definitive Securities in lieu of
which they are issued and with such appropriate insertions, omissions,
substitutions and other variations as the officers executing such Securities may
determine, as conclusively evidenced by their execution of such Securities.


                                       25




                  If temporary Securities are issued, the Company shall cause
Definitive Securities to be prepared without unreasonable delay. The Definitive
Securities shall be printed, typewritten, lithographed or engraved, or provided
by any combination thereof, or in any other manner permitted by the rules and
regulations of any applicable securities exchange, all as determined by the
officers executing such Definitive Securities. After the preparation of
Definitive Securities, the temporary Securities shall be exchangeable for
Definitive Securities upon surrender of the temporary Securities at the office
or agency maintained by the Company for such purpose pursuant to Section 3.02
hereof, without charge to the Holder. Upon surrender for cancellation of any one
or more temporary Securities, the Company shall execute, and the Trustee shall
authenticate and make available for delivery, in exchange therefor the same
aggregate principal amount of Definitive Securities of authorized denominations.
Until so exchanged, the temporary Securities shall in all respects be entitled
to the same benefits under this Indenture as Definitive Securities.

                  SECTION 2.11.  Cancellation.

                  The Company at any time may deliver Securities to the Trustee
for cancellation. The Trustee and no one else shall cancel all Securities
surrendered for registration of transfer, exchange, payment, replacement or
cancellation and shall retain or destroy cancelled Securities in accordance with
its normal practices (subject to the record retention requirement of the
Exchange Act) unless the Company directs them to be returned to it. The Company
may not issue new Securities to replace Securities that have been redeemed or
paid or that have been delivered to the Trustee for cancellation. All cancelled
Securities not destroyed by the Trustee shall be delivered to the Company.


                                       26




                  SECTION 2.12.  Defaulted Interest.

                  Any interest on any Security that is payable, but is not
punctually paid or duly provided for, on any Interest Payment Date (herein
called "Defaulted Interest") shall forthwith cease to be payable to the holder
on the relevant regular record date by virtue of having been such holder; and
such Defaulted Interest shall be paid by the Company, at its election, as
provided in clause (a) or clause (b) below:

                  (a) The Company may make payment of any Defaulted Interest on
         Securities to the Persons in whose names such Securities (or their
         respective Predecessor Securities) are registered at the close of
         business on a special record date for the payment of such Defaulted
         Interest, which shall be fixed in the following manner: the Company
         shall notify the Trustee in writing of the amount of Defaulted Interest
         proposed to be paid on each such Security and the date of the proposed
         payment, and at the same time the Company shall deposit with the
         Trustee an amount of money equal to the aggregate amount proposed to be
         paid in respect of such Defaulted Interest or shall make arrangements
         satisfactory to the Trustee for such deposit prior to the date of the
         proposed payment, such money when deposited to be held in trust for the
         benefit of the Persons entitled to such Defaulted Interest as in this
         clause provided. Thereupon the Trustee shall fix a special record date
         for the payment of such Defaulted Interest which shall not be more than
         15 nor less than 10 days prior to the date of the proposed payment and
         not less than 10 days after the receipt by the Trustee of the notice of
         the proposed payment. The Trustee shall promptly notify the Company of
         such special record date and, in the name and at the expense of the
         Company, shall cause notice of the proposed payment of such Defaulted
         Interest and the special record date therefor to be mailed, first class
         postage prepaid, to each Securityholder at his or her address as it
         appears in the Security Register, not less than 10 days prior to such
         special record date. Notice of the proposed payment of such Defaulted
         Interest and the special record date therefor having been mailed as
         aforesaid, such Defaulted Interest shall be paid to the Persons in
         whose names such Securities (or their respective Predecessor
         Securities) are registered on such special record date and shall be no
         longer payable pursuant to the following clause (b).


                                       27




                  (b) The Company may make payment of any Defaulted Interest on
any Securities in any other lawful manner not inconsistent with the requirements
of any securities exchange on which such Securities may be listed, and upon such
notice as may be required by such exchange, if, after notice given by the
Company to the Trustee of the proposed payment pursuant to this clause, such
manner of payment shall be deemed practicable by the Trustee.

                  SECTION 2.13.  CUSIP Numbers.

                  The Company in issuing the Securities may use "CUSIP" numbers
(if then generally in use), and, if so, the Trustee shall use "CUSIP" numbers in
notices of prepayment as a convenience to Securityholders; provided that any
such notice may state that no representation is made as to the correctness of
such numbers either as printed on the Securities or as contained in any notice
of a prepayment and that reliance may be placed only on the other identification
numbers printed on the Securities, and any such prepayment shall not be affected
by any defect in or omission of such numbers. The Company will promptly notify
the Trustee of any change in the CUSIP numbers.

                                  ARTICLE III.

                       PARTICULAR COVENANTS OF THE COMPANY

                  SECTION 3.01.     Payment of Principal, Premium and Interest

                  The Company covenants and agrees for the benefit of the
holders of the Securities that it will duly and punctually pay or cause to be
paid the principal of and premium, if any, and interest on the Securities at the
place, at the respective times and in the manner provided herein. The Company
further covenants to pay any and all amounts including, without limitation,
Liquidated Damages, if any, on the dates and in the manner required under the
Registration Rights Agreement.


                                       28




                  SECTION 3.02.  Offices for Notices and Payments, etc.

                  So long as any of the Securities remains outstanding, the
Company will maintain in the Borough of Manhattan, The City of New York, an
office or agency where the Securities may be presented for payment, an office or
agency where the Securities may be presented for registration of transfer and
for exchange as in this Indenture provided and an office or agency where notices
and demands to or upon the Company in respect of the Securities or of this
Indenture may be served. The Company will give to the Trustee written notice of
the location of any such office or agency and of any change of location thereof.
Until otherwise designated from time to time by the Company in a notice to the
Trustee, any such office or agency for all of the above purposes shall be the
office or agency of the Trustee in the Borough of Manhattan, The City of New
York. In case the Company shall fail to maintain any such office or agency in
the Borough of Manhattan, The City of New York, or shall fail to give such
notice of the location or of any change in the location thereof, presentations
and demands may be made and notices may be served at the principal corporate
trust office of the Trustee.

                  In addition to any such office or agency, the Company may from
time to time designate one or more offices or agencies outside the Borough of
Manhattan, The City of New York, where the Securities may be presented for
registration of transfer and for exchange in the manner provided in this
Indenture, and the Company may from time to time rescind such designation, as
the Company may deem desirable or expedient; provided, however, that no such
designation or rescission shall in any manner relieve the Company of its
obligation to maintain any such office or agency in the Borough of Manhattan,
The City of New York, for the purposes above mentioned. The Company will give to
the Trustee prompt written notice of any such designation or rescission thereof;
provided, further, that the Company shall at all times maintain a paying agent
in each such office or agency.


                                       29



                  SECTION 3.03.     Appointments to Fill Vacancies in Trustee's
                                    Office.

                  The Company, whenever necessary to avoid or fill a vacancy in
the office of Trustee, will appoint, in the manner provided in Section 6.10, a
Trustee, so that there shall at all times be a Trustee hereunder.

                  SECTION 3.04.  Provision as to Paying Agent.

                  (a)      If the Company shall appoint a paying agent other
                           than the Trustee with respect to the Securities, it
                           will cause such paying agent to execute and deliver
                           to the Trustee an instrument in which such agent
                           shall agree with the Trustee, subject to the
                           provision of this Section 3.04,

                           (1)      that it will hold all sums held by it as
                                    such agent for the payment of the principal
                                    of and premium, if any, or interest on the
                                    Securities (whether such sums have been paid
                                    to it by the Company or by any other obligor
                                    on the Securities) in trust for the benefit
                                    of the holders of the Securities; and

                           (2)      that it will give the Trustee notice of any
                                    failure by the Company (or by any other
                                    obligor on the Securities) to make any
                                    payment of the principal of and premium or
                                    interest on the Securities when the same
                                    shall be due and payable.

                  (b)      If the Company shall act as its own paying agent, it
                           will, on or before each due date of the principal of
                           and premium, if any, or interest on the Securities,
                           set aside, segregate and hold in trust for the
                           benefit of the holders of the Securities a sum
                           sufficient to pay such principal, premium or interest
                           so becoming due and will notify the Trustee of any
                           failure to take such action and of any failure by the
                           Company (or by any other obligor under the
                           Securities) to make any payment of the principal of
                           and premium, if any, or interest on the Securities
                           when the same shall become due and payable.


                                       30




                  (c)      Anything in this Section 3.04 to the contrary
                           notwithstanding, the Company may, at any time, for
                           the purpose of obtaining a satisfaction and discharge
                           with respect to the Securities hereunder, or for any
                           other reason, pay or cause to be paid to the Trustee
                           all sums held in trust for any such Securities by the
                           Trustee or any paying agent hereunder, as required by
                           this Section 3.04, such sums to be held by the
                           Trustee upon the trusts herein contained.

                  (d)      Anything in this Section 3.04 to the contrary
                           notwithstanding, the agreement to hold sums in trust
                           as provided in this Section 3.04 is subject to
                           Sections 11.03 and 11.04.

                  SECTION 3.05.  Certificate to Trustee.

                  The Company will deliver to the Trustee on or before 120 days
after the end of each fiscal year in each year, commencing with the first fiscal
year ending after the date hereof, so long as Securities are outstanding
hereunder, an Officers' Certificate, one of the signers of which shall be the
principal executive, principal financial or principal accounting officer of the
Company, stating that in the course of the performance by the signers of their
duties as officers of the Company they would normally have knowledge of any
default by the Company in the performance of any covenants contained herein,
stating whether or not they have knowledge of any such default and, if so,
specifying each such default of which the signers have knowledge and the nature
thereof.

                                       31




                  SECTION 3.06.     Compliance with Consolidation Provisions.

                  The Company will not, while any of the Securities remain
outstanding, consolidate with, or merge into, or merge into itself, or sell or
convey all or substantially all of its property to, any other Person unless the
provisions of Article X hereof are complied with.

                  SECTION 3.07.  Limitation on Dividends.

                  The Company will not (i) declare or pay any dividends or
distributions on, or redeem, purchase, acquire, or make a liquidation payment
with respect to, any of the Company's capital stock (which includes common and
preferred stock) or (ii) make any payment of principal, interest or premium, if
any, on or repay or repurchase or redeem any debt securities of the Company
(including any Other Debentures) that rank pari passu with or junior in right of
payment to the Securities or (iii) make any guarantee payments with respect to
any guarantee by the Company of the debt securities of any Subsidiary of the
Company (including Other Guarantees) if such guarantee ranks pari passu or
junior in right of payment to the Securities (other than (a) dividends or
distributions in shares of, or options, warrants or rights to subscribe for or
purchase shares of, Common Stock of the Company, (b) any declaration of a
dividend in connection with the implementation of a stockholder's rights plan,
or the issuance of stock under any such plan in the future, or the redemption or
repurchase of any such rights pursuant thereto, (c) payments under the Capital
Securities Guarantee, (d) as a result of a reclassification of the Company's
capital stock or the exchange or the conversion of one class or series of the
Company's capital stock for another class or series of the Company's capital
stock, (e) the purchase of fractional interests in shares of the Company's
capital stock pursuant to the conversion or exchange provisions of such capital
stock or the security being converted or exchanged, and (f) purchases or
issuances of Common Stock in connection with any of the Company's stock option,
stock purchase, stock loan or other benefit plans for its directors, officers or
employees or any of the Company's dividend

                                       32



reinvestment plans, in each case as now existing or hereafter established or
amended) if at such time (i) there shall have occurred any event of which the
Company has actual knowledge that (a) with the giving of notice or the lapse of
time, or both, would constitute an Event of Default and (b) in respect of which
the Company shall not have taken reasonable steps to cure, (ii) if such
Securities are held by the Property Trustee, the Company shall be in default
with respect to its payment of any obligations under the Capital Securities
Guarantee or (iii) the Company shall have given notice of its election of the
exercise of its right to extend the interest payment period pursuant to Section
16.01 and any such extension shall be continuing.

                  SECTION 3.08.  Covenants as to Markel Capital Trust

                  In the event Securities are issued to Markel Capital Trust or
a trustee of such trust in connection with the issuance of Trust Securities by
Markel Capital Trust, for so long as such Trust Securities remain outstanding,
the Company will (i) directly or indirectly maintain 100% ownership of the
Common Securities of Markel Capital Trust; provided, however, that any successor
of the Company, permitted pursuant to Article X, may succeed to the Company's
ownership of such Common Securities, (ii) use its reasonable efforts to cause
Markel Capital Trust (a) to remain a business trust, except in connection with a
distribution of Securities to the holders of the Trust Securities in a
liquidation of Markel Capital Trust, the redemption of all of the Trust
Securities of Markel Capital Trust or certain mergers, consolidations or
amalgamations, each as permitted by the Declaration of Markel Capital Trust, and
(b) to continue to be treated as a grantor trust and not as an association
taxable as a corporation or a partnership for United States federal income tax
purposes and (iii) to use its reasonable efforts to cause each holder of Trust
Securities to be treated as owning an undivided beneficial interest in the
Securities.

                  SECTION 3.09.  Payment of Expenses.

                  In connection with the offering, sale and issuance of the
Securities to Markel Capital Trust and in connection with the sale of the Trust
Securities by Markel Capital Trust, the Company, in its capacity as borrower
with respect to the Securities, shall:


                                       33



                  (a) pay all costs and expenses relating to the offering, sale
and issuance of the Securities, including commissions to the initial purchasers
payable pursuant to the Purchase Agreement, fees and expenses in connection with
any exchange offer or other action to be taken pursuant to the Registration
Rights Agreement and compensation of the Trustee in accordance with the
provisions of Section 6.06;

                  (b) pay all costs and expenses of Markel Capital Trust
(including, but not limited to, costs and expenses relating to the organization
of Markel Capital Trust, the offering, sale and issuance of the Trust Securities
(including commissions to the initial purchasers payable pursuant to the
Purchase Agreement in connection therewith), the fees and expenses of the
Property Trustee and the Delaware Trustee, the costs and expenses relating to
the operation of the Trust, including without limitation, costs and expenses of
accountants, attorneys, statistical or bookkeeping services, expenses for
printing and engraving and computing or accounting equipment, paying agent(s),
registrar(s), transfer agent(s), duplicating, travel and telephone and other
telecommunications expenses and costs and expenses incurred in connection with
the acquisition, financing and disposition of the assets of Markel Capital
Trust;

                  (c)      be primarily and fully liable for any indemnification
obligations arising with respect to the Declaration;

                  (d) pay any and all taxes (other than United States
withholding taxes attributable to Markel Capital Trust or its assets) and all
liabilities, costs and expenses with respect to such taxes of Markel Capital
Trust; and

                  (e)      pay all other fees, expenses, debts and obligations
(other than the Trust Securities) related to Markel Capital Trust.

                  SECTION 3.10.  Payment Upon Resignation or Removal.


                                       34



                  Upon termination of this Indenture or the removal or
resignation of the Trustee, unless otherwise stated, the Company shall pay to
the Trustee all amounts accrued and owing to the date of such termination,
removal or resignation. Upon termination of the Declaration or the removal or
resignation of the Delaware Trustee or the Property Trustee, as the case may be,
pursuant to Section 5.7 of the Declaration, the Company shall pay to the
Delaware Trustee or the Property Trustee, as the case may be, all amounts
accrued and owing to the date of such termination, removal or resignation.

                                   ARTICLE IV.

           SECURITYHOLDERS' LISTS AND REPORTS BY THE COMPANY AND THE
                                    TRUSTEE


                  SECTION 4.01.  Securityholders' Lists.

                  The Company covenants and agrees that it will furnish or cause
to be furnished to the Trustee:

                  (a)      on a semi-annual basis on each regular record date
                           for the Securities, a list, in such form as the
                           Trustee may reasonably require, of the names and
                           addresses of the Securityholders as of such record
                           date; and

                  (b)      at such other times as the Trustee may request in
                           writing, within 30 days after the receipt by the
                           Company of any such request, a list of similar form
                           and content as of a date not more than 15 days prior
                           to the time such list is furnished;

except that, no such lists need be furnished so long as the Trustee is in
possession thereof by reason of its acting as Security registrar.

                  SECTION 4.02.  Preservation and Disclosure of Lists.


                                       35




                  (a)      The Trustee shall preserve, in as current a form as
                           is reasonably practicable, all information as to the
                           names and addresses of the holders of the Securities
                           (1) contained in the most recent list furnished to it
                           as provided in Section 4.01 or (2) received by it in
                           the capacity of Securities registrar (if so acting)
                           hereunder.  The Trustee may destroy any list
                           furnished to it as provided in Section 4.01 upon
                           receipt of a new list so furnished.

                  (b)      In case three or more holders of Securities
                           (hereinafter referred to as "applicants") apply in
                           writing to the Trustee and furnish to the Trustee
                           reasonable proof that each such applicant has owned a
                           Security for a period of at least six months
                           preceding the date of such application, and such
                           application states that the applicants desire to
                           communicate with other holders of Securities or with
                           holders of all Securities with respect to their
                           rights under this Indenture and is accompanied by a
                           copy of the form of proxy or other communication
                           which such applicants propose to transmit, then the
                           Trustee shall within 5 Business Days after the
                           receipt of such application, at its election, either:

                  (1)      afford such applicants access to the information
                           preserved at the time by the Trustee in accordance
                           with the provisions of subsection (a) of this Section
                           4.02; or

                  (2)      inform such applicants as to the approximate number
                           of holders of all Securities, whose names and
                           addresses appear in the information preserved at the
                           time by the Trustee in accordance with the provisions
                           of subsection (a) of this Section 4.02, and as to the
                           approximate cost of mailing to such Securityholders
                           the form of proxy or other communication, if any,
                           specified in such application.


                                       36



                                    If the Trustee shall elect not to afford
                           such applicants access to such information, the
                           Trustee shall, upon the written request of such
                           applicants, mail to each Securityholder whose name
                           and address appear in the information preserved at
                           the time by the Trustee in accordance with the
                           provisions of subsection (a) of this Section 4.02 a
                           copy of the form of proxy or other communication
                           which is specified in such request with reasonable
                           promptness after a tender to the Trustee of the
                           material to be mailed and of payment, or provision
                           for the payment, of the reasonable expenses of
                           mailing, unless within five days after such tender,
                           the Trustee shall mail to such applicants and file
                           with the Commission, together with a copy of the
                           material to be mailed, a written statement to the
                           effect that, in the opinion of the Trustee, such
                           mailing would be contrary to the best interests of
                           the holders of all Securities or would be in
                           violation of applicable law. Such written statement
                           shall specify the basis of such opinion. If the
                           Commission, after opportunity for a hearing upon the
                           objections specified in the written statement so
                           filed, shall enter an order refusing to sustain any
                           of such objections or if, after the entry of an order
                           sustaining one or more of such objections, the
                           Commission shall find, after notice and opportunity
                           for hearing, that all the objections so sustained
                           have been met and shall enter an order so declaring,
                           the Trustee shall mail copies of such material to all
                           such Securityholders with reasonable promptness after
                           the entry of such order and the renewal of such
                           tender; otherwise the Trustee shall be relieved of
                           any obligation or duty to such applicants respecting
                           their application.

                  (c)      Each and every holder of Securities, by receiving and
                           holding the same, agrees with the Company and the
                           Trustee that neither the Company nor the Trustee nor
                           any paying agent shall be held accountable by reason


                                       37




                           of the disclosure of any such information as to the
                           names and addresses of the holders of Securities in
                           accordance with the provisions of subsection (b) of
                           this Section 4.02, regardless of the source from
                           which such information was derived, and that the
                           Trustee shall not be held accountable by reason of
                           mailing any material pursuant to a request made under
                           said subsection (b).

                  SECTION 4.03.  Reports of the Company

                  (a)      The Company covenants and agrees to file with the
                           Trustee, within 15 days after the date on which the
                           Company is required to file the same with the
                           Commission, copies of the annual reports and of the
                           information, documents and other reports (or copies
                           of such portions of any of the foregoing as the
                           Commission may from time to time by rules and
                           regulations prescribe) which the Company may be
                           required to file with the Commission pursuant to
                           Section 13 or Section 15(d) of the Exchange Act; or,
                           if the Company is not required to file information,
                           documents or reports pursuant to either of such
                           sections, then to file with the Trustee and the
                           Commission, in accordance with rules and regulations
                           prescribed from time to time by the Commission, such
                           of the supplementary and periodic information,
                           documents and reports which may be required pursuant
                           to Section 13 of the Exchange Act in respect of a
                           security listed and registered on a national
                           securities exchange as may be prescribed from time to
                           time in such rules and regulations.

                  (b)      The Company covenants and agrees to file with the
                           Trustee and the Commission, in accordance with the
                           rules and regulations prescribed from time to time by
                           the Commission, such additional information,
                           documents and reports with respect to compliance by
                           the Company with the conditions and covenants
                           provided for in this Indenture as may be required
                           from time to time by such rules and regulations.


                                       38



                  (c)      The Company covenants and agrees to transmit by mail
                           to all holders of Securities, as the names and
                           addresses of such holders appear upon the Security
                           Register, within 30 days after the filing thereof
                           with the Trustee, such summaries of any information,
                           documents and reports required to be filed by the
                           Company pursuant to subsections (a) and (b) of this
                           Section 4.03 as may be required by rules and
                           regulations prescribed from time to time by the
                           Commission.

                  (d)      Delivery of such reports, information and documents
                           to the Trustee is for informational purposes only and
                           the Trustee's receipt of such shall not constitute
                           constructive notice of any information contained
                           therein or determinable from information contained
                           therein, including the Company's compliance with any
                           of its covenants hereunder (as to which the Trustee
                           is entitled to rely exclusively on Officers'
                           Certificates).

                  (e)      So long as is required for an offer or sale of the
                           Securities to qualify for an exemption under Rule
                           144A under the Securities Act, the Company shall,
                           upon request, provide the information required by
                           clause (d)(4) thereunder to each holder of Restricted
                           Securities and to each beneficial owner and
                           prospective purchaser of Securities identified by any
                           holder of Restricted Securities, unless such
                           information is furnished to the Commission pursuant
                           to Section 13 or 15(d) of the Exchange Act.

                  SECTION 4.04.  Reports by the Trustee

                  (a)      The Trustee shall transmit to Securityholders such
                           reports concerning the Trustee and its actions under
                           this Indenture as may be required pursuant to the


                                       39



                           Trust Indenture Act of 1939 at the times and in the
                           manner provided pursuant thereto.  If required by
                           Section 313(a) of the Trust Indenture Act of 1939,
                           the Trustee shall, within sixty days after each May
                           15 following the date of this Indenture, commencing
                           May 15, 1997, deliver to Securityholders a brief
                           report, dated as of such May 15, which complies with
                           the provisions of such Section 313(a).

                  (b)      A copy of each such report shall, at the time of such
                           transmission to Securityholders, be filed by the
                           Trustee with each stock exchange, if any, upon which
                           the Securities are listed, with the Commission and
                           with the Company. The Company will promptly notify
                           the Trustee when the Securities are listed on any
                           stock exchange.

                                   ARTICLE V.

                   REMEDIES OF THE TRUSTEE AND SECURITYHOLDERS ON EVENT OF
                               DEFAULT

                  SECTION 5.01.  Events of Default.

                  One or more of the following events of default shall
constitute an Event of Default hereunder (whatever the reason for such Event of
Default and whether it shall be voluntary or involuntary or be effected by
operation of law or pursuant to any judgment, decree or order of any court or
any order, rule or regulation of any administrative or governmental body):

                  (a)      default in the payment of any interest upon any
                           Security or any Other Debentures when it becomes due
                           and payable, and continuance of such default for a
                           period of 30 days; provided, however, that a
                           valid extension of an interest payment period by the
                           Company in accordance with the terms hereof or, in
                           the case of any Other Debentures, the indenture
                           related thereto, shall not constitute a default in
                           the payment of interest for this purpose; or


                                       40



                  (b)      default in the payment of all or any part of the
                           principal of (or premium, if any, on) any Security
                           or any Other Debentures as and when the same shall
                           become due and payable either at maturity, upon
                           prepayment, by declaration of acceleration of
                           maturity or otherwise; or

                  (c)      default in any material respect in the
                           performance, or breach, of any covenant or
                           warranty of the Company in this Indenture (other
                           than a covenant or warranty a default in whose
                           performance or whose breach is elsewhere in this
                           Section specifically dealt with), and continuance
                           of such default or breach for a period of 90 days
                           after there has been given, by registered or
                           certified mail, to the Company by the Trustee or
                           to the Company and the Trustee by the holders of
                           at least 25% in aggregate principal amount of the
                           outstanding Securities a written notice specifying
                           such default or breach and requiring it to be
                           remedied and stating that such notice is a "Notice
                           of Default" hereunder; or

                  (d)      a court having jurisdiction in the premises shall
                           enter a decree or order for relief in respect of
                           the Company in an involuntary case under any
                           applicable bankruptcy, insolvency or other similar
                           law now or hereafter in effect, or appointing a
                           receiver, liquidator, assignee, custodian,
                           trustee, sequestrator (or similar official) of the
                           Company or for any substantial part of its
                           property, or ordering the winding-up or
                           liquidation of its affairs and such decree or
                           order shall remain unstayed and in effect for a
                           period of 90 consecutive days; or

                  (e)      the Company shall commence a voluntary case under
                           any applicable bankruptcy, insolvency or other


                                       41



                           similar law now or hereafter in effect, shall
                           consent to the entry of an order for relief in an
                           involuntary case under any such law, or shall
                           consent to the appointment of or taking possession
                           by a receiver, liquidator, assignee, trustee,
                           custodian, sequestrator (or other similar
                           official) of the Company or of any substantial
                           part of its property, or shall make any general
                           assignment for the benefit of creditors, or shall
                           fail generally to pay its debts as they become
                           due.

                  If an Event of Default with respect to Securities at the time
outstanding occurs and is continuing, then in every such
case the Trustee or the holders of not less than 25% in aggregate principal
amount of the Securities then outstanding may declare the principal amount of
all Securities to be due and payable immediately, by a notice in writing to the
Company (and to the Trustee if given by the holders of the outstanding
Securities), and upon any such declaration the same shall become immediately due
and payable.

                  The foregoing provisions, however, are subject to the
condition that if, at any time after the principal of the Securities shall have
been so declared due and payable, and before any judgment or decree for the
payment of the moneys due shall have been obtained or entered as hereinafter
provided, (i) the Company shall pay or shall deposit with the Trustee a sum
sufficient to pay (A) all matured installments of interest upon all the
Securities and the principal of and premium, if any, on any and all Securities
which shall have become due otherwise than by acceleration (with interest upon
such principal and premium, if any, and, to the extent that payment of such
interest is enforceable under applicable law, on overdue installments of
interest, at the same rate as the rate of interest specified in the Securities
to the date of such payment or deposit) and (B) such amount as shall be
sufficient to pay to the Trustee and each predecessor Trustee all amounts
payable pursuant to Section 6.06, and (ii) any and all Events of Default under
the Indenture shall have been cured, waived or otherwise remedied as provided
herein, then, in every such case, the holders of a majority in aggregate
principal amount of the Securities then outstanding, by written notice to the
Company and to the Trustee, may rescind and annul such declaration and its
consequences, but no such waiver or rescission and annulment shall extend to or
shall affect any subsequent default or shall impair any right consequent
thereon.


                                       42



                  In case the Trustee shall have proceeded to enforce any right
under this Indenture and such proceedings shall have been discontinued or
abandoned because of such rescission or annulment or for any other reason or
shall have been determined adversely to the Trustee, then and in every such case
the Company, the Trustee and the holders of the Securities shall be restored
respectively to their several positions and rights hereunder, and all rights,
remedies and powers of the Company, the Trustee and the holders of the
Securities shall continue as though no such proceeding had been taken.

                  SECTION 5.02.     Payment of Securities on Default; Suit
                                    Therefor.

                  The Company covenants that (a) in case default shall be made
in the payment of any installment of interest upon any of the Securities as and
when the same shall become due and payable, and such default shall have
continued for a period of 30 days, or (b) in case default shall be made in the
payment of the principal of or premium, if any, on any of the Securities as and
when the same shall have become due and payable, whether at maturity of the
Securities or upon prepayment or by declaration of acceleration of maturity or
otherwise, then, upon demand of the Trustee, the Company will pay to the
Trustee, for the benefit of the holders of the Securities, the whole amount that
then shall have become due and payable on all such Securities for principal and
premium, if any, or interest, or both, as the case may be, with interest upon
the overdue principal and premium, if any, and (to the extent that payment of
such interest is enforceable under applicable law and, if the Securities are
held by Markel Capital Trust or a trustee of such trust, without duplication of
any other amounts paid by Markel Capital Trust or a trustee in respect thereof)
upon the overdue installments of interest at the rate borne by the Securities;
and, in addition thereto, such further amount as shall be sufficient to cover
the costs and expenses of collection, including a reasonable compensation to the
Trustee, its agents, attorneys and counsel, and any expenses or liabilities
incurred by the Trustee hereunder other than through its negligence or bad
faith.


                                       43



                  In case the Company shall fail forthwith to pay such amounts
upon such demand, the Trustee, in its own name and as trustee of an express
trust, shall be entitled and empowered to institute any actions or proceedings
at law or in equity for the collection of the sums so due and unpaid, and may
prosecute any such action or proceeding to judgment or final decree, and may
enforce any such judgment or final decree against the Company or any other
obligor on the Securities and collect in the manner provided by law out of the
property of the Company or any other obligor on the Securities wherever situated
the moneys adjudged or decreed to be payable.

                  In case there shall be pending proceedings for the bankruptcy
or for the reorganization of the Company or any other obligor on the Securities
under Title 11, United States Code, or any other applicable law, or in case a
receiver or trustee shall have been appointed for the property of the Company or
such other obligor, or in the case of any other similar judicial proceedings
relative to the Company or other obligor upon the Securities, or to the
creditors or property of the Company or such other obligor, the Trustee,
irrespective of whether the principal of the Securities shall then be due and
payable as therein expressed or by declaration or otherwise and irrespective of
whether the Trustee shall have made any demand pursuant to the provisions of
this Section 5.02, shall be entitled and empowered, by intervention in such
proceedings or otherwise, to file and prove a claim or claims for the whole
amount of principal and interest owing and unpaid in respect of the Securities
and, in case of any judicial proceedings, to file such proofs of claim and other
papers or documents as may be necessary or advisable in order to have the claims
of the Trustee (including any claim for all amounts payable pursuant to Section
6.06 to the Trustee and each predecessor Trustee) and of the Securityholders
allowed in such judicial proceedings relative to the Company or any other
obligor on the Securities, or to the creditors or property of the Company or
such other obligor, unless prohibited by applicable law and



                                       44




regulations, to vote on behalf of the holders of the Securities in any election
of a trustee or a standby trustee in arrangement, reorganization, liquidation or
other bankruptcy or insolvency proceedings or Person performing similar
functions in comparable proceedings, and to collect and receive any moneys or
other property payable or deliverable on any such claims, and to distribute the
same after the deduction of its charges and expenses; and any receiver, assignee
or trustee in bankruptcy or reorganization is hereby authorized by each of the
Securityholders to make such payments to the Trustee, and, in the event that the
Trustee shall consent to the making of such payments directly to the
Securityholders, to pay to the Trustee such amounts as shall be sufficient to
pay to the Trustee and each predecessor Trustee all amounts payable pursuant to
Section 6.06.

                  Nothing herein contained shall be construed to authorize the
Trustee to authorize or consent to or accept or adopt on behalf of any
Securityholder any plan of reorganization, arrangement, adjustment or
composition affecting the Securities or the rights of any holder thereof or to
authorize the Trustee to vote in respect of the claim of any Securityholder in
any such proceeding.

                  All rights of action and of asserting claims under this
Indenture, or under any of the Securities, may be enforced by the Trustee
without the possession of any of the Securities, or the production thereof in
any trial or other proceeding relative thereto, and any such suit or proceeding
instituted by the Trustee shall be brought in its own name as trustee of an
express trust, and any recovery of judgment shall be for the ratable benefit of
the holders of the Securities.

                  In any proceedings brought by the Trustee (and also any
proceedings involving the interpretation of any provision of this Indenture to
which the Trustee shall be a party) the Trustee shall be held to represent all
the holders of the Securities, and it shall not be necessary to make any holders
of the Securities parties to any such proceedings.



                                       45




                  SECTION 5.03.     Application of Moneys Collected by Trustee.

                  Any moneys collected by the Trustee shall be applied in the
order following, at the date or dates fixed by the Trustee for the distribution
of such moneys, upon presentation of the Securities in respect of which moneys
have been collected, and stamping thereon the payment, if only partially paid,
and upon surrender thereof if fully paid:

                  First: To the payment of all amounts due the Trustee under
Section 6.06, including the costs and expenses of collection applicable to the
Securities and reasonable compensation to the Trustee, its agents, attorneys and
counsel, and of all other expenses and liabilities incurred, and all advances
made, by the Trustee except as a result of its negligence or bad faith;

                  Second: To the payment of all Senior Indebtedness of the
Company if and to the extent required by Article XV;

                  Third: In case the principal of the outstanding Securities in
respect of which moneys have been collected shall not have become due and be
unpaid, to the payment of the amounts then due and unpaid upon Securities for
principal of (and premium, if any) and interest on the Securities, in respect of
which or for the benefit of which money has been collected, ratably, without
preference of priority of any kind, according to the amounts due on such
Securities for principal (and premium, if any) and interest, respectively; and

                  Fourth: To the Company.

                  SECTION 5.04.  Proceedings by Securityholders.

                  Except as contemplated by this Section 5.04, no holder of any
Security shall have any right by virtue of or by availing of any provision of
this Indenture to institute any suit, action or proceeding in equity or at law
upon or under or with respect to this Indenture or for the appointment of a
receiver or trustee, or for any other remedy hereunder, unless such holder


                                       46




previously shall have given to the Trustee written notice of an Event of Default
and of the continuance thereof with respect to the Securities specifying such
Event of Default, as hereinbefore provided, and unless also the holders of not
less than 25% in aggregate principal amount of the Securities then outstanding
shall have made written request upon the Trustee to institute such action, suit
or proceeding in its own name as Trustee hereunder and shall have offered to the
Trustee such reasonable indemnity as it may require against the costs, expenses
and liabilities to be incurred therein or thereby, and the Trustee for 60 days
after its receipt of such notice, request and offer of indemnity shall have
failed to institute any such action, suit or proceeding, it being understood and
intended, and being expressly covenanted by the taker and holder of every
Security with every other taker and holder and the Trustee, that no one or more
holders of Securities shall have any right in any manner whatever by virtue of
or by availing of any provision of this Indenture to affect, disturb or
prejudice the rights of any other holder of Securities, or to obtain or seek to
obtain priority over or preference to any other such holder, or to enforce any
right under this Indenture, except in the manner herein provided and for the
equal, ratable and common benefit of all holders of Securities.

                  Notwithstanding any other provisions in this Indenture,
however, the right of any holder of any Security to receive payment of the
principal of (premium, if any) and interest on such Security, on or after the
same shall have become due and payable, or to institute suit for the enforcement
of any such payment, shall not be impaired or affected without the consent of
such holder and by accepting a Security hereunder it is expressly understood,
intended and covenanted by the taker and holder of every Security with every
other such taker and holder and the Trustee, that no one or more holders of
Securities shall have any right in any manner whatsoever by virtue or by
availing of any provision of this Indenture to affect, disturb or prejudice the
rights of the holders of any other Securities, or to obtain or seek to obtain
priority over or preference to any other such holder, or to enforce any right
under this Indenture, except in the manner herein provided and for the equal,
ratable and common benefit of all holders of Securities. For the protection and
enforcement of the provisions of this Section, each and every Securityholder and
the Trustee shall be entitled to such relief as can be given either at law or in
equity.


                                       47




                  The Company and the Trustee acknowledge that pursuant to the
Declaration, the holders of Capital Securities are entitled, in the
circumstances and subject to the limitations set forth therein, to commence a
Direct Action with respect to any Event of Default under this Indenture and the
Securities.

                  SECTION 5.05.  Proceedings by Trustee.

                  In case an Event of Default occurs with respect to Securities
and is continuing, the Trustee may in its discretion proceed to protect and
enforce the rights vested in it by this Indenture by such appropriate judicial
proceedings as the Trustee shall deem most effectual to protect and enforce any
of such rights, either by suit in equity or by action at law or by proceeding in
bankruptcy or otherwise, whether for the specific enforcement of any covenant or
agreement contained in this Indenture or in aid of the exercise of any power
granted in this Indenture, or to enforce any other legal or equitable right
vested in the Trustee by this Indenture or by law.

                  SECTION 5.06.  Remedies Cumulative and Continuing.

                  All powers and remedies given by this Article V to the Trustee
or to the Securityholders shall, to the extent permitted by law, be deemed
cumulative and not exclusive of any other powers and remedies available to the
Trustee or the holders of the Securities, by judicial proceedings or otherwise,
to enforce the performance or observance of the covenants and agreements
contained in this Indenture or otherwise established with respect to the
Securities, and no delay or omission of the Trustee or of any holder of any of
the Securities to exercise any right or power accruing upon any Event of Default
occurring and continuing as aforesaid shall impair any such right or power, or
shall be construed to be a waiver of any such default or an acquiescence
therein; and, subject to the provisions of Section 5.04, every power and remedy
given by this Article V or by law to the Trustee or to the Securityholders may
be exercised from time to time, and as often as shall be deemed expedient, by
the Trustee or by the Securityholders.


                                       48



                  SECTION 5.07.     Direction of Proceedings and Waiver of
                                    Defaults by Majority of Securityholders.

                  The holders of a majority in aggregate principal amount of the
Securities at the time outstanding shall have the right to direct the time,
method, and place of conducting any proceeding for any remedy available to the
Trustee, or exercising any trust or power conferred on the Trustee; provided,
however, that (subject to the provisions of Section 6.01) the Trustee shall have
the right to decline to follow any such direction if the Trustee shall determine
that the action so directed would be unjustly prejudicial to the holders not
taking part in such direction or if the Trustee being advised by counsel
determines that the action or proceeding so directed may not lawfully be taken
or if the Trustee in good faith by its board of directors or trustees, executive
committee, or a trust committee of directors or trustees and/or Responsible
Officers shall determine that the action or proceedings so directed would
involve the Trustee in personal liability. Prior to any declaration accelerating
the maturity of the Securities, the holders of a majority in aggregate principal
amount of the Securities at the time outstanding may on behalf of the holders of
all of the Securities waive any past default or Event of Default and its
consequences except a default (a) in the payment of principal of or premium, if
any, or interest on any of the Securities or (b) in respect of covenants or
provisions hereof which cannot be modified or amended without the consent of the
holder of each Security affected; provided, however, that if the Securities are
held by the Property Trustee, such waiver or modification to such waiver shall
not be effective until the holders of a majority in aggregate liquidation amount
of Trust Securities shall have consented to such waiver or modification to such
waiver; provided further, that if the consent of the holder of each outstanding
Security is required, such waiver shall not be effective until each holder of
the Trust Securities shall have consented to such waiver. Upon any such waiver,
the default covered thereby shall be deemed to be cured for all purposes of this
Indenture and the Company, the Trustee and the holders of the Securities shall
be restored to their former positions and rights hereunder, respectively; but no
such waiver shall extend to any subsequent or other default or impair any right
consequent thereon. Whenever any default or Event of Default hereunder shall
have been waived as permitted by this Section 5.07, said default or Event of
Default shall for all purposes of the Securities and this Indenture be deemed to
have been cured and to be not continuing.


                                       49



                  SECTION 5.08.  Notice of Defaults.

                  The Trustee shall, within 90 days after the occurrence of a
default with respect to the Securities known to the Trustee, mail to all
Securityholders, as the names and addresses of such holders appear upon the
Security register, notice of all defaults known to the Trustee, unless such
defaults shall have been cured before the giving of such notice (the term
"defaults" for the purpose of this Section 5.08 being hereby defined to be the
events specified in clauses (a), (b), (c), (d) and (e) of Section 5.01, not
including periods of grace, if any, provided for therein, and irrespective of
the giving of written notice specified in clause (c) of Section 5.01); and
provided that, except in the case of default in the payment of the principal of
or premium, if any, or interest on any of the Securities, the Trustee shall be
protected in withholding such notice if and so long as the board of directors,
the executive committee, or a trust committee of directors and/or Responsible
Officers of the Trustee in good faith determines that the withholding of such
notice is in the interests of the Securityholders; and provided further, that in
the case of any default of the character specified in Section 5.01(c) no such
notice to Securityholders shall be given until at least 60 days after the
occurrence thereof but shall be given within 90 days after such occurrence.


                  SECTION 5.09.  Undertaking to Pay Costs.

                  All parties to this Indenture agree, and each holder of any
Security by his acceptance thereof shall be deemed to have agreed, that any
court may in its discretion require, in any suit for the enforcement of any
right or remedy under this Indenture, or in any suit against the Trustee for any
action taken or omitted by it as Trustee, the filing by any party litigant in


                                       50




such suit of an undertaking to pay the costs of such suit, and that such court
may in its discretion assess reasonable costs, including reasonable attorneys'
fees and expenses, against any party litigant in such suit, having due regard to
the merits and good faith of the claims or defenses made by such party litigant;
but the provisions of this Section 5.09 shall not apply to any suit instituted
by the Trustee, to any suit instituted by any Securityholder, or group of
Securityholders, holding in the aggregate more than 10% in aggregate principal
amount of the Securities outstanding, or to any suit instituted by any
Securityholder for the enforcement of the payment of the principal of (or
premium, if any) or interest on any Security against the Company on or after the
same shall have become due and payable.

                                   ARTICLE VI. CONCERNING THE TRUSTEE

                  SECTION 6.01.  Duties and Responsibilities of Trustee.

                  With respect to the holders of the Securities issued
hereunder, the Trustee, prior to the occurrence of an Event of Default and after
the curing or waiving of all Events of Default which may have occurred,
undertakes to perform such duties and only such duties as are specifically set
forth in this Indenture. In case an Event of Default has occurred (which has not
been cured or waived) the Trustee shall exercise such of the rights and powers
vested in it by this Indenture, and use the same degree of care and skill in
their exercise, as a prudent man would exercise or use under the circumstances
in the conduct of his own affairs.

                  No provision of this Indenture shall be construed to relieve
the Trustee from liability for its own negligent action, its own negligent
failure to act or its own willful misconduct, except that

                  (a)      prior to the occurrence of an Event of Default and
                           after the curing or waiving of all Events of Default
                           which may have occurred

                                       51



                           (1)      the duties and obligations of the Trustee
                                    shall be determined solely by the express
                                    provisions of this Indenture, and the
                                    Trustee shall not be liable except for the
                                    performance of such duties and obligations
                                    as are specifically set forth in this
                                    Indenture, and no implied covenants or
                                    obligations shall be read into this
                                    Indenture against the Trustee; and

                           (2)      in the absence of bad faith on the part of
                                    the Trustee, the Trustee may conclusively
                                    rely, as to the truth of the statements and
                                    the correctness of the opinions expressed
                                    therein, upon any certificates or opinions
                                    furnished to the Trustee and conforming to
                                    the requirements of this Indenture; but, in
                                    the case of any such certificates or
                                    opinions that by any provision hereof are
                                    specifically required to be furnished to the
                                    Trustee, the Trustee shall be under a duty
                                    to examine the same to determine whether or
                                    not they conform to the requirements of this
                                    Indenture;

                  (b)      the Trustee shall not be liable for any error of
                           judgment made in good faith by a Responsible Officer
                           or Officers of the Trustee, unless it shall be proved
                           that the Trustee was negligent in ascertaining the
                           pertinent facts; and

                  (c)      the Trustee shall not be liable with respect to
                           any action taken or omitted to be taken by it in
                           good faith, in accordance with the direction of
                           the Securityholders pursuant to Section 5.07,
                           relating to the time, method and place of
                           conducting any proceeding for any remedy available
                           to the Trustee, or exercising any trust or power
                           conferred upon the Trustee, under this Indenture.

                                       52




                  None of the provisions contained in this Indenture shall
require the Trustee to expend or risk its own funds or otherwise incur personal
financial liability in the performance of any of its duties or in the exercise
of any of its rights or powers, if there is reasonable ground for believing that
the repayment of such funds or liability is not reasonably assured to it under
the terms of this Indenture and that adequate indemnity against such risk is not
reasonably assured to it.

                  SECTION 6.02.  Reliance on Documents, Opinions, etc.

                  Except as otherwise provided in Section 6.01:

                  (a)      the Trustee may rely and shall be protected in
                           acting or refraining from acting upon any
                           resolution, certificate, statement, instrument,
                           opinion, report, notice, request, consent, order,
                           bond, note, debenture or other paper or document
                           believed by it to be genuine and to have been
                           signed or presented by the proper party or
                           parties;

                  (b)      any request, direction, order or demand of the
                           Company mentioned herein may be sufficiently
                           evidenced by an Officers' Certificate (unless
                           other evidence in respect thereof be herein
                           specifically prescribed); and any Board Resolution
                           may be evidenced to the Trustee by a copy thereof
                           certified by the Secretary or an Assistant
                           Secretary  of the Company;

                  (c)      the Trustee may consult with counsel of its selection
                           and any advice or Opinion of Counsel shall be full
                           and complete authorization and protection in respect
                           of any action taken or suffered omitted by it
                           hereunder in good faith and in accordance with such
                           advice or Opinion of Counsel;

                  (d)      the Trustee shall be under no obligation to
                           exercise any of the rights or powers vested in it
                           by this Indenture at the request, order or
                           direction of any of the Securityholders, pursuant
                           to the provisions of this Indenture, unless such
                           Securityholders shall have offered to the Trustee
                           reasonable security or indemnity against the
                           costs, expenses and liabilities which may be
                           incurred therein or thereby;


                                       53




                  (e)      the Trustee shall not be liable for any action
                           taken or omitted by it in good faith and believed
                           by it to be authorized or within the discretion or
                           rights or powers conferred upon it by this
                           Indenture; nothing contained herein shall,
                           however, relieve the Trustee of the obligation,
                           upon the occurrence of an Event of Default (that
                           has not been cured or waived), to exercise such of
                           the rights and powers vested in it by this
                           Indenture, and to use the same degree of care and
                           skill in their exercise, as a prudent man would
                           exercise or use under the circumstances in the
                           conduct of his own affairs;

                  (f)      the Trustee shall not be bound to make any
                           investigation into the facts or matters stated in
                           any resolution, certificate, statement,
                           instrument, opinion, report, notice, request,
                           consent, order, approval, bond, debenture, coupon
                           or other paper or document, unless requested in
                           writing to do so by the holders of a majority in
                           aggregate principal amount of the outstanding
                           Securities; provided, however, that if the payment
                           within a reasonable time to the Trustee of the
                           costs, expenses or liabilities likely to be
                           incurred by it in the making of such investigation
                           is, in the opinion of the Trustee, not reasonably
                           assured to the Trustee by the security afforded to
                           it by the terms of this Indenture, the Trustee may
                           require reasonable indemnity against such expense
                           or liability as a condition to so proceeding; and

                                       54




                  (g)      the Trustee may execute any of the trusts or powers
                           hereunder or perform any duties hereunder either
                           directly or by or through agents (including any
                           Authenticating Agent) or attorneys, and the Trustee
                           shall not be responsible for any misconduct or
                           negligence on the part of any such agent or attorney
                           appointed by it with due care.

                  SECTION 6.03.  No Responsibility for Recitals, etc.

                  The recitals contained herein and in the Securities (except in
the certificate of authentication of the Trustee or the Authenticating Agent)
shall be taken as the statements of the Company and the Trustee and the
Authenticating Agent assume no responsibility for the correctness of the same.
The Trustee and the Authenticating Agent make no representations as to the
validity or sufficiency of this Indenture or of the Securities. The Trustee and
the Authenticating Agent shall not be accountable for the use or application by
the Company of any Securities or the proceeds of any Securities authenticated
and delivered by the Trustee or the Authenticating Agent in conformity with the
provisions of this Indenture.

                  SECTION 6.04. Trustee, Authenticating Agent, Paying Agents,
                                 Transfer Agents or Registrar May Own
                                 Securities.

                  The Trustee or any Authenticating Agent or any paying agent or
any transfer agent or any Security registrar, in its individual or any other
capacity, may become the owner or pledgee of Securities with the same rights it
would have if it were not Trustee, Authenticating Agent, paying agent, transfer
agent or Security registrar.

                  SECTION 6.05.  Moneys to be Held in Trust.

                  Subject to the provisions of Section 11.04, all moneys
received by the Trustee or any paying agent shall, until used or applied as
herein provided, be held in trust for the purpose for which they were received,
but need not be segregated from other funds except to the extent required by
law. The Trustee and any paying agent shall be under no liability for interest
on any money received by it hereunder except as otherwise agreed in writing with
the Company.

                                       55




                  SECTION 6.06.  Compensation and Expenses of Trustee.

                  The Company, as borrower, covenants and agrees to pay to the
Trustee from time to time, and the Trustee shall be entitled to, such
compensation as shall be agreed to in writing between the Company and the
Trustee (which shall not be limited by any provision of law in regard to the
compensation of a trustee of an express trust), and the Company will pay or
reimburse the Trustee upon its request for all reasonable expenses,
disbursements and advances incurred or made by the Trustee in accordance with
any of the provisions of this Indenture (including the reasonable compensation
and the expenses and disbursements of its counsel and of all Persons not
regularly in its employ) except any such expense, disbursement or advance as may
arise from its negligence or bad faith. The Company also covenants to indemnify
each of the Trustee or any predecessor Trustee (and its officers, agents,
directors and employees) for, and to hold each of them harmless against, any and
all loss, damage, claim, liability or expense including taxes (other than taxes
based on the income of the Trustee) incurred without negligence or bad faith on
the part of the Trustee and arising out of or in connection with the acceptance
or administration of this trust, including the costs and expenses of defending
itself against any claim of liability in the premises. The obligations of the
Company under this Section 6.06 shall constitute additional indebtedness
hereunder. Such additional indebtedness shall be secured by a lien prior to that
of the Securities upon all property and funds held or collected by the Trustee
as such, except funds held in trust for the benefit of the holders of particular
Securities.

                  When the Trustee incurs expenses or renders services in
connection with an Event of Default specified in Section 5.01(d) or Section
5.01(e), the expenses (including the reasonable charges and expenses of its
counsel) and the compensation for the services are intended to constitute
expenses of administration under any applicable federal or state bankruptcy,
insolvency or other similar law.

                                       56




                  The provisions of this Section shall survive the resignation
or removal of the Trustee and the defeasance or other termination of this
Indenture.

                  SECTION 6.07.  Officers' Certificate as Evidence.

                  Except as otherwise provided in Sections 6.01 and 6.02,
whenever in the administration of the provisions of this Indenture the Trustee
shall deem it necessary or desirable that a matter be proved or established
prior to taking or omitting any action hereunder, such matter (unless other
evidence in respect thereof is herein specifically prescribed) may, in the
absence of negligence or bad faith on the part of the Trustee, be deemed to be
conclusively proved and established by an Officers' Certificate delivered to the
Trustee, and such certificate, in the absence of negligence or bad faith on the
part of the Trustee, shall be full warrant to the Trustee for any action taken
or omitted by it under the provisions of this Indenture upon the faith thereof.

                  SECTION 6.08.  Conflicting Interest of Trustee.

                  If the Trustee has or shall acquire any "conflicting interest"
within the meaning of Section 310(b) of the Trust Indenture Act, the Trustee and
the Company shall in all respects comply with the provisions of Section 310(b)
of the Trust Indenture Act.

                  SECTION 6.09.  Eligibility of Trustee.

                  The Trustee hereunder shall at all times be a corporation
organized and doing business under the laws of the United States of America or
any state or territory thereof or of the District of Columbia or a corporation
or other Person permitted to act as trustee by the Commission authorized under
such laws to exercise corporate trust powers, having a combined capital and
surplus of at least 50 million U.S. dollars ($50,000,000) and subject to
supervision or examination by federal, state, territorial, or District of
Columbia authority. If such corporation publishes reports of condition at least
annually, pursuant to law or to the requirements of the aforesaid supervising or
examining authority, then for the purposes of this Section 6.09 the combined
capital and surplus of such corporation shall be deemed to be its combined
capital and surplus as set forth in its most recent report of condition so
published.

                                       57



                  The Company may not, nor may any Person directly or indirectly
controlling, controlled by, or under common control with the Company, serve as
Trustee.

                  In case at any time the Trustee shall cease to be eligible in
accordance with the provisions of this Section 6.09, the Trustee shall resign
immediately in the manner and with the effect specified in Section 6.10.

                  SECTION 6.10.     Resignation or Removal of Trustee.

                  (a)      The Trustee, or any trustee or trustees hereafter
                           appointed, may at any time resign by giving
                           written notice of such resignation to the Company
                           and by mailing notice thereof to the holders of
                           the Securities at their addresses as they shall
                           appear on the Security register.  Upon receiving
                           such notice of resignation, the Company shall
                           promptly appoint a successor trustee or trustees
                           by written instrument, in duplicate, one copy of
                           which instrument shall be delivered to the
                           resigning Trustee and one copy to the successor
                           trustee.  If no successor trustee shall have been
                           so appointed and have accepted appointment within
                           60 days after the mailing of such notice of
                           resignation to the affected Securityholders, the
                           resigning Trustee may petition any court of
                           competent jurisdiction for the appointment of a
                           successor trustee, or any Securityholder who has
                           been a bona fide holder of a Security for at least
                           six months may, subject to the provisions of
                           Section 5.09, on behalf of himself and all others
                           similarly situated, petition any such court for
                           the appointment of a successor trustee.  Such
                           court may thereupon, after such notice, if any, as
                           it may deem proper and prescribe, appoint a
                           successor trustee.

                                       58




                  (b)      In case at any time any of the following shall
                           occur:

                           (1)      the Trustee shall fail to comply with the
                                    provisions of Section 6.08 after written
                                    request therefor by the Company or by any
                                    Securityholder who has been a bona fide
                                    holder of a Security or Securities for at
                                    least six months, or

                           (2)      the Trustee shall cease to be eligible in
                                    accordance with the provisions of Section
                                    6.09 and shall fail to resign after written
                                    request therefor by the Company or by any
                                    such Securityholder, or

                           (3)      the Trustee shall become incapable of
                                    acting, or shall be adjudged a bankrupt or
                                    insolvent, or a receiver of the Trustee or
                                    of its property shall be appointed, or any
                                    public officer shall take charge or control
                                    of the Trustee or of its property or affairs
                                    for the purpose of rehabilitation,
                                    conservation or liquidation,

                           then, in any such case, the Company may remove the
                           Trustee and appoint a successor trustee by written
                           instrument, in duplicate, one copy of which
                           instrument shall be delivered to the Trustee so
                           removed and one copy to the successor trustee, or,
                           subject to the provisions of Section 5.09, any
                           Securityholder who has been a bona fide holder of a
                           Security for at least six months may, on behalf of
                           himself and all others similarly situated, petition
                           any court of competent jurisdiction for the removal
                           of the Trustee and the appointment of a successor
                           trustee. Such court may thereupon, after such notice,
                           if any, as it may deem proper and prescribe, remove
                           the Trustee and appoint a successor trustee.

                                       59




                  (c)      The holders of a majority in aggregate principal
                           amount of the Securities at the time outstanding
                           may at any time remove the Trustee and nominate a
                           successor trustee, which shall be deemed appointed
                           as successor trustee unless within 10 days after
                           such nomination the Company objects thereto or if
                           no successor trustee shall have been so appointed
                           and shall have accepted appointment within 30 days
                           after such removal, in which case the Trustee so
                           removed or any Securityholder, upon the terms and
                           conditions and otherwise as in subsection (a) of
                           this Section 6.10 provided, may petition any court
                           of competent jurisdiction for an appointment of a
                           successor trustee.

                  (d)      Any resignation or removal of the Trustee and
                           appointment of a successor trustee pursuant to any of
                           the provisions of this Section 6.10 shall become
                           effective upon acceptance of appointment by the
                           successor trustee as provided in Section 6.11.

                  SECTION 6.11.  Acceptance by Successor Trustee.

                  Any successor trustee appointed as provided in Section 6.10
shall execute, acknowledge and deliver to the Company and to its predecessor
trustee an instrument accepting such appointment hereunder, and thereupon the
resignation or removal of the retiring trustee shall become effective and such
successor trustee, without any further act, deed or conveyance, shall become
vested with all the rights, powers, duties and obligations of its predecessor
hereunder, with like effect as if originally named as trustee herein; but,
nevertheless, on the written request of the Company or of the successor trustee,
the trustee ceasing to act shall, upon payment of any amounts then due it
pursuant to the provisions of Section 6.06, execute and deliver an instrument
transferring to such successor trustee all the rights and powers of the trustee

                                       60



so ceasing to act and shall duly assign, transfer and deliver to such successor
trustee all property and money held by such retiring trustee thereunder. Upon
request of any such successor trustee, the Company shall execute any and all
instruments in writing for more fully and certainly vesting in and confirming to
such successor trustee all such rights and powers. Any trustee ceasing to act
shall, nevertheless, retain a lien upon all property or funds held or collected
by such trustee to secure any amounts then due it pursuant to the provisions of
Section 6.06.

                  No successor trustee shall accept appointment as provided in
this Section 6.11 unless at the time of such acceptance such successor trustee
shall be qualified under the provisions of Section 6.08 and eligible under the
provisions of Section 6.09.

                  Upon acceptance of appointment by a successor trustee as
provided in this Section 6.11, the Company shall mail notice of the succession
of such trustee hereunder to the holders of Securities at their addresses as
they shall appear on the Security register. If the Company fails to mail such
notice within 10 days after the acceptance of appointment by the successor
trustee, the successor trustee shall cause such notice to be mailed at the
expense of the Company.

                  SECTION 6.12.  Successor by Merger, etc.

                  Any corporation into which the Trustee may be merged or
converted or with which it may be consolidated, or any corporation resulting
from any merger, conversion or consolidation to which the Trustee shall be a
party, or any corporation succeeding to all or substantially all of the
corporate trust business of the Trustee, shall be the successor of the Trustee
hereunder without the execution or filing of any paper or any further act on the
part of any of the parties hereto.

                  In case at the time such successor to the Trustee shall
succeed to the trusts created by this Indenture any Securities shall have been
authenticated but not delivered, any such successor to the Trustee may adopt the
certificate of authentication of any predecessor trustee, and deliver such

                                       61



Securities so authenticated; and in case at that time any of the Securities
shall not have been authenticated, any successor to the Trustee may authenticate
such Securities either in the name of any predecessor hereunder or in the name
of the successor trustee; and in all such cases such certificates shall have the
full force which the Securities or this Indenture elsewhere provides that the
certificate of the Trustee shall have; provided, however, that the right to
adopt the certificate of authentication of any predecessor Trustee or
authenticate Securities in the name of any predecessor Trustee shall apply only
to its successor or successors by merger, conversion or consolidation.

                  SECTION 6.13.     Limitation on Rights of Trustee as a
                                    Creditor.

                  The Trustee shall comply with Section 311(a) of the Trust
Indenture Act of 1939, excluding any creditor relationship described in Section
311(b) of the Trust Indenture Act of 1939. A Trustee who has resigned or been
removed shall be subject to Section 311(a) of the Trust Indenture Act of 1939 to
the extent included therein.

                  SECTION 6.14.  Authenticating Agents.

                  There may be one or more Authenticating Agents appointed by
the Trustee upon the request of the Company with power to act on its behalf and
subject to its direction in the authentication and delivery of Securities issued
upon exchange or registration of transfer thereof as fully to all intents and
purposes as though any such Authenticating Agent had been expressly authorized
to authenticate and deliver Securities; provided, that the Trustee shall have no
liability to the Company for any acts or omissions of the Authenticating Agent
with respect to the authentication and delivery of Securities. Any such
Authenticating Agent shall at all times be a corporation organized and doing
business under the laws of the United States or of any state or territory
thereof or of the District of Columbia authorized under such laws to act as
Authenticating Agent, having a combined capital and surplus of at least
$5,000,000 and being subject to supervision or examination by federal, state,

                                       62



territorial or District of Columbia authority. If such corporation publishes
reports of condition at least annually pursuant to law or the requirements of
such authority, then for the purposes of this Section 6.14 the combined capital
and surplus of such corporation shall be deemed to be its combined capital and
surplus as set forth in its most recent report of condition so published. If at
any time an Authenticating Agent shall cease to be eligible in accordance with
the provisions of this Section, it shall resign immediately in the manner and
with the effect herein specified in this Section.

                  Any corporation into which any Authenticating Agent may be
merged or converted or with which it may be consolidated, or any corporation
resulting from any merger, consolidation or conversion to which any
Authenticating Agent shall be a party, or any corporation succeeding to the
corporate trust business of any Authenticating Agent, shall be the successor of
such Authenticating Agent hereunder, if such successor corporation is otherwise
eligible under this Section 6.14 without the execution or filing of any paper or
any further act on the part of the parties hereto or such Authenticating Agent.

                  Any Authenticating Agent may at any time resign by giving
written notice of resignation to the Trustee and to the Company. The Trustee may
at any time terminate the agency of any Authenticating Agent by giving written
notice of termination to such Authenticating Agent and to the Company. Upon
receiving such a notice of resignation or upon such a termination, or in case at
any time any Authenticating Agent shall cease to be eligible under this Section
6.14, the Trustee may, and upon the request of the Company shall, promptly
appoint a successor Authenticating Agent eligible under this Section 6.14, shall
give written notice of such appointment to the Company and shall mail notice of
such appointment to all Securityholders as the names and addresses of such
holders appear on the Security Register. Any successor Authenticating Agent upon
acceptance of its appointment hereunder shall become vested with all rights,
powers, duties and responsibilities of its predecessor hereunder, with like
effect as if originally named as Authenticating Agent herein.

                                       63



                  The Company, as borrower, agrees to pay to any Authenticating
Agent from time to time reasonable compensation for its services. Any
Authenticating Agent shall have no responsibility or liability for any action
taken by it as such in accordance with the directions of the Trustee.

                                  ARTICLE VII.
                         CONCERNING THE SECURITYHOLDERS

                  SECTION 7.01.  Action by Securityholders.

                  Whenever in this Indenture it is provided that the holders of
a specified percentage in aggregate principal amount of the Securities may take
any action (including the making of any demand or request, the giving of any
notice, consent or waiver or the taking of any other action) the fact that at
the time of taking any such action the holders of such specified percentage have
joined therein may be evidenced (a) by any instrument or any number of
instruments of similar tenor executed by such Securityholders in person or by
agent or proxy appointed in writing, or (b) by the record of such holders of
Securities voting in favor thereof at any meeting of such Securityholders duly
called and held in accordance with the provisions of Article VIII, or (c) by a
combination of such instrument or instruments and any such record of such a
meeting of such Securityholders.

                  If the Company shall solicit from the Securityholders any
request, demand, authorization, direction, notice, consent, waiver or other
action, the Company may, at its option, as evidenced by an Officers'
Certificate, fix in advance a record date for the determination of
Securityholders entitled to give such request, demand, authorization, direction,
notice, consent, waiver or other action, but the Company shall have no
obligation to do so. If such a record date is fixed, such request, demand,
authorization, direction, notice, consent, waiver or other action may be given
before or after the record date, but only the Securityholders of record at the
close of business on the record date shall be deemed to be Securityholders for
the purposes of determining whether Securityholders of the requisite proportion
of Outstanding Securities have authorized or agreed or consented to such

                                       64




request, demand, authorization, direction, notice, consent, waiver or other
action, and for that purpose the Outstanding Securities shall be computed as of
the record date; provided, however, that no such authorization, agreement or
consent by such Securityholders on the record date shall be deemed effective
unless it shall become effective pursuant to the provisions of this Indenture
not later than six months after the record date.


                  SECTION 7.02.  Proof of Execution by Securityholders.

                  Subject to the provisions of Sections 6.01, 6.02 and 8.05,
proof of the execution of any instrument by a Securityholder or his agent or
proxy shall be sufficient if made in accordance with such reasonable rules and
regulations as may be prescribed by the Trustee or in such manner as shall be
satisfactory to the Trustee. The ownership of Securities shall be proved by the
Security Register or by a certificate of the Security registrar. The Trustee may
require such additional proof of any matter referred to in this Section as it
shall deem necessary.

                  The record of any Securityholders' meeting shall be proved in
the manner provided in Section 8.06.

                  SECTION 7.03.  Who Are Deemed Absolute Owners.

                  Prior to due presentment for registration of transfer of any
Security, the Company, the Trustee, any Authenticating Agent, any paying agent,
any transfer agent and any Security registrar may deem the Person in whose name
such Security shall be registered upon the Security Register to be, and may
treat him as, the absolute owner of such Security (whether or not such Security
shall be overdue) for the purpose of receiving payment of or on account of the
principal of and premium, if any, and interest on such Security and for all
other purposes; and neither the Company nor the Trustee nor any Authenticating
Agent nor any paying agent nor any transfer agent nor any Security registrar
shall be affected by any notice to the contrary. All such payments so made to
any holder for the time being or upon his order shall be valid, and, to the
extent of the sum or sums so paid, effectual to satisfy and discharge the
liability for moneys payable upon any such Security.


                                       65




                  SECTION 7.04.    Securities Owned by Company Deemed Not
                                   Outstanding.

                  In determining whether the holders of the requisite aggregate
principal amount of Securities have concurred in any direction, consent or
waiver under this Indenture, Securities which are owned by the Company or any
other obligor on the Securities or by any Person directly or indirectly
controlling or controlled by or under direct or indirect common control with the
Company, except for the Securities owned by or on behalf of Markel Capital
Trust, or any other obligor on the Securities shall be disregarded and deemed
not to be outstanding for the purpose of any such determination; provided that
for the purposes of determining whether the Trustee shall be protected in
relying on any such direction, consent or waiver, only Securities which a
Responsible Officer of the Trustee actually knows are so owned shall be so
disregarded. Securities so owned which have been pledged in good faith may be
regarded as outstanding for the purposes of this Section 7.04 if the pledgee
shall establish to the satisfaction of the Trustee the pledgee's right to vote
such Securities and that the pledgee is not the Company or any such other
obligor or Person directly or indirectly controlling or controlled by or under
direct or indirect common control with the Company or any such other obligor. In
the case of a dispute as to such right, any decision by the Trustee taken upon
the advice of counsel shall be full protection to the Trustee.

                  SECTION 7.05.    Revocation of Consents; Future Holders
                                   Bound.

                  At any time prior to (but not after) the evidencing to the
Trustee, as provided in Section 7.01, of the taking of any action by the holders
of the percentage in aggregate principal amount of the Security specified in
this Indenture in connection with such action, any holder of a Security (or any
Security issued in whole or in part in exchange or substitution therefor) the
serial number of which is shown by the evidence to be included in the Securities
the holders of which have consented to such action may, by filing written notice

                                       66




with the Trustee at its principal office and upon proof of holding as provided
in Section 7.02, revoke such action so far as concerns such Security (or so far
as concerns the principal amount represented by any exchanged or substituted
Security). Except as aforesaid, any such action taken by the holder of any
Security shall be conclusive and binding upon such holder and upon all future
holders and owners of such Security, and of any Security issued in exchange or
substitution therefor, irrespective of whether or not any notation in regard
thereto is made upon such Security or any Security issued in exchange or
substitution therefor.

                                  ARTICLE VIII.
                            SECURITYHOLDERS' MEETINGS

                  SECTION 8.01.  Purpose of Meetings

                  A meeting of Securityholders may be called at any time and
from time to time pursuant to the provisions of this Article VIII for any of the
following purposes:

                  (a)      to give any notice to the Company or to the Trustee,
                           or to give any directions to the Trustee, or to
                           consent to the waiving of any Default hereunder and
                           its consequences, or to take any other action
                           authorized to be taken by Securityholders pursuant to
                           any of the provisions of Article V;

                  (b)      to remove the Trustee and nominate a successor
                           trustee pursuant to the provisions of Article VI;

                  (c)      to consent to the execution of an indenture or
                           indentures supplemental hereto pursuant to the
                           provisions of Section 9.02; or

                  (d)      to take any other action authorized to be taken by or
                           on behalf of the holders of any specified aggregate
                           principal amount of such Securities under any other
                           provision of this Indenture or under applicable law.


                                       67




                  SECTION 8.02.  Call of Meetings by Trustee.

                  The Trustee may at any time call a meeting of Securityholders
to take any action specified in Section 8.01, to be held at such time and at
such place in the Borough of Manhattan, The City of New York, as the Trustee
shall determine. Notice of every meeting of the Securityholders, setting forth
the time and the place of such meeting and in general terms the action proposed
to be taken at such meeting, shall be mailed to holders of Securities at their
addresses as they shall appear on the Securities Register. Such notice shall be
mailed not less than 20 nor more than 180 days prior to the date fixed for the
meeting.

                  SECTION 8.03.    Call of Meetings by Company or
                                   Securityholders.

                  In case at any time the Company pursuant to a resolution of
the Board of Directors, or the holders of at least 10% in aggregate principal
amount of the Securities then outstanding, shall have requested the Trustee to
call a meeting of Securityholders, by written request setting forth in
reasonable detail the action proposed to be taken at the meeting, and the
Trustee shall not have mailed the notice of such meeting within 20 days after
receipt of such request, then the Company or such Securityholders may determine
the time and the place in the Borough of Manhattan, The City of New York, for
such meeting and may call such meeting to take any action authorized in Section
8.01, by mailing notice thereof as provided in Section 8.02.

                  SECTION 8.04.  Qualifications for Voting.

                  To be entitled to vote at any meeting of Securityholders a
Person shall be (a) a holder of one or more Securities or (b) a Person appointed
by an instrument in writing as proxy by a holder of one or more Securities. The
only Persons who shall be entitled to be present or to speak at any meeting of
Securityholders shall be the Persons entitled to vote at such meeting and their
counsel and any representatives of the Trustee and its counsel and any
representatives of the Company and its counsel.

                                       68




                  SECTION 8.05.  Regulations.

                  Notwithstanding any other provisions of this Indenture, the
Trustee may make such reasonable regulations as it may deem advisable for any
meeting of Securityholders, in regard to proof of the holding of Securities and
of the appointment of proxies, and in regard to the appointment and duties of
inspectors of votes, the submission and examination of proxies, certificates and
other evidence of the right to vote, and such other matters concerning the
conduct of the meeting as it shall think fit.

                  The Trustee shall, by an instrument in writing, appoint a
temporary chairman of the meeting, unless the meeting shall have been called by
the Company or by Securityholders as provided in Section 8.03, in which case the
Company or the Securityholders calling the meeting, as the case may be, shall in
like manner appoint a temporary chairman. A permanent chairman and a permanent
secretary of the meeting shall be elected by majority vote of the meeting.

                  Subject to the provisions of Section 8.04, at any meeting each
holder of Securities or proxy therefor shall be entitled to one vote for each
$1,000 principal amount of Securities held or represented by him; provided,
however, that no vote shall be cast or counted at any meeting in respect of any
Security challenged as not outstanding and ruled by the chairman of the meeting
to be not outstanding. The chairman of the meeting shall have no right to vote
other than by virtue of Securities held by him or instruments in writing as
aforesaid duly designating him as the person to vote on behalf of other
Securityholders. Any meeting of Securityholders duly called pursuant to the
provisions of Section 8.02 or 8.03 may be adjourned from time to time by a
majority of those present, whether or not constituting a quorum, and the meeting
may be held as so adjourned without further notice.


                                       69




                  SECTION 8.06.  Voting.

                  The vote upon any resolution submitted to any meeting of
holders of Securities shall be by written ballots on which shall be subscribed
the signatures of such holders or of their representatives by proxy and the
serial number or numbers of the Securities held or represented by them. The
permanent chairman of the meeting shall appoint two inspectors of votes who
shall count all votes cast at the meeting for or against any resolution and who
shall make and file with the secretary of the meeting their verified written
reports in triplicate of all votes cast at the meeting. A record in duplicate of
the proceedings of each meeting of Securityholders shall be prepared by the
secretary of the meeting and there shall be attached to said record the original
reports of the inspectors of votes on any vote by ballot taken thereat and
affidavits by one or more persons having knowledge of the facts setting forth a
copy of the notice of the meeting and showing that said notice was mailed as
provided in Section 8.02. The record shall show the serial numbers of the
Securities voting in favor of or against any resolution. The record shall be
signed and verified by the affidavits of the permanent chairman and secretary of
the meeting and one of the duplicates shall be delivered to the Company and the
other to the Trustee to be preserved by the Trustee, the latter to have attached
thereto the ballots voted at the meeting. The holders of the Series A Securities
and the Series B Securities shall vote for all purposes as a single class.

                  Any record so signed and verified shall be conclusive evidence
of the matters therein stated.


                                       70




                                   ARTICLE IX.
                                   AMENDMENTS

                  SECTION 9.01.  Without Consent of Securityholders.

                  The Company, when authorized by a Board Resolution, and the
Trustee may from time to time and at any time amend this Indenture, without the
consent of the Securityholders, for one or more of the following purposes:

                  (a)      to evidence the succession of another corporation to
                           the Company, or successive successions, and the
                           assumption by the successor corporation of the
                           covenants, agreements and obligations of the Company
                           pursuant to Article X hereof;

                  (b)      to add to the covenants of the Company such
                           further covenants, restrictions or conditions for
                           the protection of the Securityholders as the Board
                           of Directors and the Trustee shall consider to be
                           for the protection of the Securityholders, and to
                           make the occurrence, or the occurrence and
                           continuance, of a default in any of such
                           additional covenants, restrictions or conditions a
                           Default or an Event of Default permitting the
                           enforcement of all or any of the remedies provided
                           in this Indenture as herein set forth; provided,
                           however, that in respect of any such additional
                           covenant, restriction or condition such amendment may
                           provide for a particular period of grace after
                           default (which period may be shorter or longer than
                           that allowed in the case of other Defaults) or may
                           provide for an immediate enforcement upon such
                           default or may limit the remedies available to the
                           Trustee upon such default;

                  (c)      to provide for the issuance under this Indenture of
                           Securities in coupon form (including Securities
                           registrable as to principal only) and to provide for
                           exchangeability of such Securities with the
                           Securities issued hereunder in fully registered form
                           and to make all appropriate changes for such purpose;


                                       71





                  (d)      to cure any ambiguity or to correct or supplement
                           any provision contained herein or in any
                           supplemental indenture which may be defective or
                           inconsistent with any other provision contained
                           herein or in any supplemental indenture, or to
                           make such other provisions in regard to matters or
                           questions arising under this Indenture; provided
                           that any such action shall not materially
                           adversely affect the interests of the holders of
                           the Securities;

                  (e)      to evidence and provide for the acceptance of
                           appointment hereunder by a successor trustee with
                           respect to the Securities;

                  (f)      to make provision for transfer procedures,
                           certification, book-entry provisions, the form of
                           restricted securities legends, if any, to be
                           placed on Securities, and all other matters
                           required pursuant to Section 2.07 or otherwise
                           necessary, desirable or appropriate in connection
                           with the issuance of Securities to holders of
                           Capital Securities in the event of a distribution
                           of Securities by Markel Capital Trust following a
                           Dissolution Event;

                  (g)      to qualify or maintain qualification of this
                           Indenture under the Trust Indenture Act of 1939;
                           or

                  (h)      to make any change that does not adversely affect
                           the rights of any Securityholder in any material
                           respect.

                  The Trustee is hereby authorized to join with the Company in
the execution of any supplemental indenture to effect such amendment, to make
any further appropriate agreements and stipulations which may be therein
contained and to accept the conveyance, transfer and assignment of any property
thereunder, but the Trustee shall not be obligated to, but may in its
discretion, enter into any such supplemental indenture which affects the
Trustee's own rights, duties or immunities under this Indenture or otherwise.

                                       72




                  Any amendment to this Indenture authorized by the provisions
of this Section 9.01 may be executed by the Company and the Trustee without the
consent of the holders of any of the Securities at the time outstanding,
notwithstanding any of the provisions of Section 9.02.

                  SECTION 9.02.  With Consent of Securityholders.

                  With the consent (evidenced as provided in Section 7.01) of
the holders of a majority in aggregate principal amount of the Securities at the
time outstanding, the Company, when authorized by a Board Resolution, and the
Trustee may from time to time and at any time amend this Indenture for the
purpose of adding any provisions to or changing in any manner or eliminating any
of the provisions of this Indenture or of modifying in any manner the rights of
the holders of the Securities; provided, however, that no such amendment shall
without the consent of the holders of each Security then outstanding and
affected hereby (i) extend the Maturity Date of any Security, or reduce the rate
or extend the time of payment of interest thereon (except as contemplated by
Article XVI), or reduce the principal amount thereof (including in the case of a
discounted Security the amount payable thereon in the event of acceleration or
the amount provable in bankruptcy), or reduce any amount payable on redemption
thereof, or make the principal thereof or any interest or premium thereon
payable in any coin or currency other than that provided in the Securities, or
impair or affect the right of any Securityholder to institute suit for payment
thereof, or (ii) reduce the aforesaid percentage of Securities the holders of
which are required to consent to any such amendment to this Indenture, provided,
however, that if the Securities are held by Markel Capital Trust, such amendment
shall not be effective until the holders of a majority in liquidation amount of
Trust Securities shall have consented to such amendment; provided, further, that
if the consent of the holder of each outstanding Security is required, such
amendment shall not be effective until each holder of the Trust Securities shall
have consented to such amendment.

                                       73




                  Upon the request of the Company accompanied by a copy of a
resolution of the Board of Directors certified by its Secretary or Assistant
Secretary authorizing the execution of any supplemental indenture affecting such
amendment, and upon the filing with the Trustee of evidence of the consent of
Securityholders as aforesaid, the Trustee shall join with the Company in the
execution of such supplemental indenture unless such supplemental indenture
affects the Trustee's own rights, duties or immunities under this Indenture or
otherwise, in which case the Trustee may in its discretion, but shall not be
obligated to, enter into such supplemental indenture.

                  Promptly after the execution by the Company and the Trustee of
any supplemental indenture pursuant to the provisions of this Section, the
Trustee shall transmit by mail, first class postage prepaid, a notice, prepared
by the Company, setting forth in general terms the substance of such
supplemental indenture, to the Securityholders as their names and addresses
appear upon the Security Register. Any failure of the Trustee to mail such
notice, or any defect therein, shall not, however, in any way impair or affect
the validity of any such supplemental indenture.

                  It shall not be necessary for the consent of the
Securityholders under this Section 9.02 to approve the particular form of any
proposed supplemental indenture, but it shall be sufficient if such consent
shall approve the substance thereof.

                  SECTION 9.03.    Compliance with Trust Indenture Act;
                                   Effect of Supplemental Indentures.

                  Any supplemental indenture executed pursuant to the provisions
of this Article IX shall comply with the Trust Indenture Act. Upon the execution
of any supplemental indenture pursuant to the provisions of this Article IX,
this Indenture shall be and be deemed to be modified and amended in accordance
therewith and the respective rights, limitations of rights, obligations, duties
and immunities under this Indenture of the Trustee, the Company and the holders
of Securities shall thereafter be determined, exercised and enforced hereunder
subject in all respects to such modifications and amendments and all the terms
and conditions of any such supplemental indenture shall be and be deemed to be
part of the terms and conditions of this Indenture for any and all purposes.

                                       74




                  SECTION 9.04.  Notation on Securities.

                  Securities authenticated and delivered after the execution of
any supplemental indenture affecting such series pursuant to the provisions of
this Article IX may bear a notation in form approved by the Trustee as to any
matter provided for in such supplemental indenture. If the Company or the
Trustee shall so determine, new Securities so modified as to conform, in the
opinion of the Trustee and the Board of Directors, to any modification of this
Indenture contained in any such supplemental indenture may be prepared and
executed by the Company, authenticated by the Trustee or the Authenticating
Agent and delivered in exchange for the Securities then outstanding.

                  SECTION 9.05.     Evidence of Compliance of Supplemental
                                    Indenture to be Furnished Trustee.

                  The Trustee, subject to the provisions of Sections 6.01 and
6.02, may receive an Officers' Certificate and an Opinion of Counsel as
conclusive evidence that any supplemental indenture executed pursuant to this
Article is authorized or permitted by, and conforms to, the terms of this
Article and that it is proper for the Trustee under the provisions of this
Article to join in the execution thereof.

                                   ARTICLE X.
               CONSOLIDATION, MERGER, SALE, CONVEYANCE AND LEASE

                  SECTION 10.01.   Company May Consolidate, etc., on
                                   Certain Terms.

                  Nothing contained in this Indenture or in any of the
Securities shall prevent any consolidation or merger of the Company with or into
any other Person (whether or not affiliated with the Company, as the case may

                                       75




be), or successive consolidations or mergers in which the Company, as the case
may be, or its successor or successors shall be a party or parties, or shall
prevent any sale, conveyance, transfer or lease of the property of the Company,
as the case may be, or its successor or successors as an entirety, or
substantially as an entirety, to any other Person (whether or not affiliated
with the Company, as the case may be, or its successor or successors) authorized
to acquire and operate the same; provided, that (a) the Company is the surviving
Person or the Person formed by or surviving any such consolidation or merger (if
other than the Company) or to which such sale, conveyance, transfer or lease of
property is made is a Person organized and existing under the laws of the United
States or any State thereof or the District of Columbia, and (b) upon any such
consolidation, merger, sale, conveyance, transfer or lease, the due and punctual
payment of the principal of (and premium, if any) and interest on the Securities
according to their tenor and the due and punctual performance and observance of
all the covenants and conditions of this Indenture to be kept or performed by
the Company shall be expressly assumed, by supplemental indenture (which shall
conform to the provisions of the Trust Indenture Act of 1939, as then in effect)
satisfactory in form to the Trustee, and executed and delivered to the Trustee
by the Person formed by such consolidation, or into which the Company, as the
case may be, shall have been merged, or by the Person which shall have acquired
such property, and (c) after giving effect to such consolidation, merger, sale,
conveyance, transfer or lease, no Default or Event of Default shall have
occurred and be continuing.

                  SECTION 10.02.   Successor Corporation to be Substituted
                                   for Company.

                  In case of any such consolidation, merger, conveyance or
transfer and upon the assumption by the successor corporation, by supplemental
indenture, executed and delivered to the Trustee and satisfactory in form to the
Trustee, of the due and punctual payment of the principal of and premium, if
any, and interest on all of the Securities and the due and punctual performance
and observance of all of the covenants and conditions of this Indenture to be
performed or observed by the Company, such successor Person shall succeed to and

                                       76




be substituted for the Company, with the same effect as if it had been named
herein as the party of the first part, and the Company thereupon shall be
relieved of any further liability or obligation hereunder or upon the
Securities. Such successor Person thereupon may cause to be signed, and may
issue either in its own name or in the name of Markel Corporation, any or all of
the Securities issuable hereunder which theretofore shall not have been signed
by the Company and delivered to the Trustee or the Authenticating Agent; and,
upon the order of such successor Person instead of the Company and subject to
all the terms, conditions and limitations in this Indenture prescribed, the
Trustee or the Authenticating Agent shall authenticate and deliver any
Securities which previously shall have been signed and delivered by the officers
of the Company to the Trustee or the Authenticating Agent for authentication,
and any Securities which such successor Person thereafter shall cause to be
signed and delivered to the Trustee or the Authenticating Agent for that
purpose. All the Securities so issued shall in all respects have the same legal
rank and benefit under this Indenture as the Securities theretofore or
thereafter issued in accordance with the terms of this Indenture as though all
of such Securities had been issued at the date of the execution hereof.

                  SECTION 10.03.   Opinion of Counsel to be Given Trustee.

                  The Trustee, subject to the provisions of Sections 6.01 and
6.02, may receive an Opinion of Counsel as conclusive evidence that any
consolidation, merger, sale, conveyance, transfer or lease, and any assumption,
permitted or required by the terms of this Article X complies with the
provisions of this Article X.

                                   ARTICLE XI.
                     SATISFACTION AND DISCHARGE OF INDENTURE

                  SECTION 11.01.  Discharge of Indenture.

                  When (a) the Company shall deliver to the Trustee for
cancellation all Securities theretofore authenticated (other than any Securities
which shall have been destroyed, lost or stolen and which shall have been


                                       77





replaced or paid as provided in Section 2.08) and not theretofore cancelled, or
(b) all the Securities not theretofore cancelled or delivered to the Trustee for
cancellation shall have become due and payable, or are by their terms to become
due and payable within one year or are to be called for prepayment within one
year under arrangements satisfactory to the Trustee for the giving of notice of
prepayment, and the Company shall deposit or cause to be deposited with the
Trustee, in trust, funds sufficient to pay on the Maturity Date or upon
prepayment all of the Securities (other than any Securities which shall have
been destroyed, lost or stolen and which shall have been replaced or paid as
provided in Section 2.08) not theretofore cancelled or delivered to the Trustee
for cancellation, including principal (and premium, if any) and interest due or
to become due to the Maturity Date or prepayment date, as the case may be, but
excluding, however, the amount of any moneys for the payment of principal (or
premium, if any) or interest on the Securities (1) theretofore repaid to the
Company in accordance with the provisions of Section 11.04, or (2) paid to any
State or to the District of Columbia pursuant to its unclaimed property or
similar laws, and if in either case the Company shall also pay or cause to be
paid all other sums payable hereunder by the Company, then this Indenture shall
cease to be of further effect except for the provisions of Sections 2.02, 2.07,
2.08, 3.01, 3.02, 3.04, 6.06, 6.10 and 11.04 hereof shall survive until such
Securities shall mature and be paid. Thereafter, Sections 6.06, 6.10 and 11.04
shall survive, and the Trustee, on demand of the Company accompanied by any
Officers' Certificate and an Opinion of Counsel to the effect that all
conditions to the satisfaction and discharge of this Indenture have been
satisfied and at the cost and expense of the Company, shall execute proper
instruments acknowledging satisfaction of and discharging this Indenture, the
Company, however, hereby agreeing to reimburse the Trustee for any costs or
expenses thereafter reasonably and properly incurred by the Trustee in
connection with this Indenture or the Securities.


                                       78






                  SECTION 11.02.    Deposited Moneys and U.S. Government
                                    Obligations to be Held in Trust by
                                    Trustee.

                  Subject to the provisions of Section 11.04, all moneys and
U.S. Government Obligations deposited with the Trustee pursuant to Sections
11.01 or 11.05 shall be held in trust and applied by it to the payment, either
directly or through any paying agent (including the Company if acting as its own
paying agent), to the holders of the particular Securities for the payment of
which such moneys or U.S. Government Obligations have been deposited with the
Trustee, of all sums due and to become due thereon for principal, premium, if
any, and interest.

                  The Company shall pay and indemnify the Trustee against any
tax, fee or other charge imposed on or assessed against the U.S. Government
Obligations deposited pursuant to Section 11.05 or the principal and interest
received in respect thereof other than any such tax, fee or other charge which
by law is for the account of the holders of outstanding Securities.

                  SECTION 11.03.  Paying Agent to Repay Moneys Held.

                  Upon the satisfaction and discharge of this Indenture all
moneys then held by any paying agent of the Securities (other than the Trustee)
shall, upon written demand of the Company, be repaid to it or paid to the
Trustee, and thereupon such paying agent shall be released from all further
liability with respect to such moneys.

                  SECTION 11.04.  Return of Unclaimed Moneys.

                  Any moneys deposited with or paid to the Trustee or any paying
agent for payment of the principal of or premium, if any, or interest on
Securities and not applied but remaining unclaimed by the holders of Securities
for two years after the date upon which the principal of or premium, if any, or
interest on such Securities, as the case may be, shall have become due and
payable, shall be repaid to the Company by the Trustee or such paying agent on
written demand; and the holder of any of the Securities shall thereafter look
only to the Company for any payment which such holder may be entitled to collect
and all liability of the Trustee or such paying agent with respect to such
moneys shall thereupon cease.


                                       79




                  SECTION 11.05.    Defeasance Upon Deposit of Moneys or
                                    U.S. Government Obligations

                  The Company shall be deemed to have been Discharged (as
defined below) from its respective obligations with respect to the Securities on
the 91st day after the applicable conditions set forth below have been satisfied
with respect to the Securities at any time after the applicable conditions set
forth below have been satisfied:

                  (1)      The Company shall have deposited or caused to be
                           deposited irrevocably with the Trustee or the
                           Defeasance Agent (as defined below) as trust funds in
                           trust, specifically pledged as security for, and
                           dedicated solely to, the benefit of the holders of
                           the Securities (i) money in an amount, or (ii) U.S.
                           Government Obligations which through the payment of
                           interest and principal in respect thereof in
                           accordance with their terms will provide, not later
                           than one day before the due date of any payment,
                           money in an amount, or (iii) a combination of (i) and
                           (ii), sufficient, in the opinion (with respect to
                           (ii) and (iii)) of a nationally recognized firm of
                           independent public accountants expressed in a written
                           certification thereof delivered to the Trustee and
                           the Defeasance Agent, if any, to pay and discharge
                           each installment of principal of and interest and
                           premium, if any, on the outstanding Securities on the
                           dates such installments of principal, premium or
                           interest are due;

                           (2) if the Securities are then listed on any national
                           securities exchange, the Company shall have delivered
                           to the Trustee and the Defeasance Agent, if any, an
                           Opinion of Counsel to the effect that the exercise of
                           the option under this Section 11.05 would not cause
                           such Securities to be delisted from such exchange;


                                       80



                           (3) no Default or Event of Default with respect to
                           the Securities shall have occurred and be continuing
                           on the date of such deposit;

                           (4) the Company shall have delivered to the Trustee
                           and the Defeasance Agent, if any, an Opinion of
                           Counsel to the effect that holders of the Securities
                           will not recognize income, gain or loss for United
                           States federal income tax purposes as a result of the
                           exercise of the option under this Section 11.05 and
                           will be subject to United States federal income tax
                           on the same amount and in the same manner and at the
                           same times as would have been the case if such option
                           had not been exercised, and such opinion shall be
                           accompanied by a private letter ruling to that effect
                           received from the United States Internal Revenue
                           Service or a revenue ruling pertaining to a
                           comparable form of transaction to that effect
                           published by the United States Internal Revenue
                           Service; and

                  (5)      the Company shall have delivered to the Trustee and
                           the Defeasance Agent, if any, an Officers'
                           Certificate and an Opinion of Counsel each stating
                           that all conditions precedent herein provided for
                           relating to the satisfaction and discharge of this
                           Indenture have been complied with.

                  "Discharged" means that the Company shall be deemed to have
paid and discharged the entire indebtedness represented by, and obligations
under, the Securities and to have satisfied all the obligations under this
Indenture relating to the Securities (and the Trustee, at the expense of the
Company, shall execute proper instruments acknowledging the same), except (A)
the rights of holders of Securities to receive, from the trust fund described in
clause (1) above, payment of the principal of and the interest and premium, if
any, on the Securities when such payments are due; (B) the Company's obligations
with respect to the Securities under Sections 2.07, 2.08, 5.02 and 11.04; and
(C) the rights, powers, trusts, duties and immunities of the Trustee hereunder.


                                       81




                  "Defeasance Agent" means another financial institution which
is eligible to act as Trustee hereunder and which assumes all of the obligations
of the Trustee necessary to enable the Trustee to act hereunder. In the event
such a Defeasance Agent is appointed pursuant to this Section, the following
conditions shall apply:

                  (1)      The Trustee shall have approval rights over the
                           document appointing such Defeasance Agent and the
                           document setting forth such Defeasance Agent's rights
                           and responsibilities; and

                  (2)      The Defeasance Agent shall provide verification to
                           the Trustee acknowledging receipt of sufficient money
                           and/or U.S. Government Obligations to meet the
                           applicable conditions set forth in this Section
                           11.05.

                  SECTION 11.06.    Reinstatement.

                  If the Trustee or any Defeasance Agent is unable to apply any
money in accordance with Section 11.05 by reason of any legal proceeding or by
reason of any order or judgment of any court or governmental authority
enjoining, restraining or otherwise prohibiting such application, the Company's
obligations under this Indenture and the Securities shall be revived and
reinstated as though no deposit had occurred pursuant to Section 11.05 until
such time as the Trustee or any Defeasance Agent is permitted to apply all such
money in accordance with Section 11.05.

                                       82




                                  ARTICLE XII

                    IMMUNITY OF INCORPORATORS, STOCKHOLDERS,
                             OFFICERS AND DIRECTORS

               SECTION 12.01. Indenture and Securities Solely
                              Corporate Obligations.

                  No recourse for the payment of the principal of or premium, if
any, or interest on any Security, or for any claim based thereon or otherwise in
respect thereof, and no recourse under or upon any obligation, covenant or
agreement of the Company in this Indenture, or in any Security, or because of
the creation of any indebtedness represented thereby, shall be had against any
incorporator, stockholder, officer or director, as such, past, present or
future, of the Company or of any successor Person to the Company, either
directly or through the Company any constitution, statute or rule of law, or by
the enforcement of any assessment or penalty or otherwise; it being expressly
understood that all such liability is hereby expressly waived and released as a
condition of, and as a consideration for, the execution of this Indenture and
the issue of the Securities.


                                  ARTICLE XIII.
                            MISCELLANEOUS PROVISIONS

                  SECTION 13.01.  Successors.

                  All the covenants, stipulations, promises and agreements in
this Indenture contained by the Company shall bind its successors and assigns
whether so expressed or not.

                  SECTION 13.02.  Official Acts by Successor Corporation.

                  Any act or proceeding by any provision of this Indenture
authorized or required to be done or performed by any board, committee or
officer of the Company shall and may be done and performed with like force and
effect by the like board, committee or officer of any corporation that shall at
the time be the lawful sole successor of the Company.


                                       83





                  SECTION 13.03.  Surrender of Company Powers.

                  The Company by instrument in writing executed by authority of
2/3 (two-thirds) of its Board of Directors and delivered to the Trustee may
surrender any of the powers reserved to the Company, and thereupon such power so
surrendered shall terminate both as to the Company, as the case may be, and as
to any successor Person.

                  SECTION 13.04.  Address for Notices, etc.

                  Any notice or demand which by any provision of this Indenture
is required or permitted to be given or served by the Trustee or by the holders
of Securities on the Company may be given or served by being deposited postage
prepaid by registered or certified mail in a post office letter box addressed
(until another address is filed by the Company with the Trustee for the purpose)
to the Company, 4551 Cox Road, Glen Allen, Virginia 23060-3382 Attention:
Corporate Counsel. Any notice, direction, request or demand by any
Securityholder to or upon the Trustee shall be deemed to have been sufficiently
given or made, for all purposes, if given or made in writing at the office of
the Trustee, 450 West 33rd Street, 15th Floor, New York, New York 10001,
Attention: Corporate Trustee Administration Department (unless another address
is provided by the Trustee to the Company for the purpose). All such notices
shall be deemed to have been given when received in person, telecopied with
receipt confirmed, and mailed by first class mail, postage prepaid, except that
if a notice or other document is refused delivery or cannot be delivered because
of a changed address of which no notice was given, such notice or other document
shall be deemed to have been delivered on the date of such refusal or inability
to deliver.


                                       84




                  SECTION 13.05.  Governing Law.

                  This Indenture and each Security shall be deemed to be a
contract made under the laws of the State of New York, and for all purposes
shall be governed by and construed in accordance with the laws of said State,
without regard to conflicts of laws principles thereof.

                  SECTION 13.06.    Evidence of Compliance with Conditions
                                    Precedent.

                  Upon any application or demand by the Company to the Trustee
to take any action under any of the provisions of this Indenture, the Company
shall furnish to the Trustee an Officers' Certificate stating that in the
opinion of the signers all conditions precedent, if any, provided for in this
Indenture relating to the proposed action have been complied with and an Opinion
of Counsel stating that, in the opinion of such counsel, all such conditions
precedent have been complied with.

                  Each certificate or opinion provided for in this Indenture and
delivered to the Trustee with respect to compliance with a condition or covenant
provided for in this Indenture shall include (1) a statement that the person
making such certificate or opinion has read such covenant or condition; (2) a
brief statement as to the nature and scope of the examination or investigation
upon which the statements or opinions contained in such certificate or opinion
are based; (3) a statement that, in the opinion of such person, he has made such
examination or investigation as is necessary to enable him to express an
informed opinion as to whether or not such covenant or condition has been
complied with; and (4) a statement as to whether or not, in the opinion of such
person, such condition or covenant has been complied with.

                  SECTION 13.07.  Business Days.

                  In any case where the date of payment of principal of or
premium, if any, or interest on the Securities will not be a Business Day, the
payment of such principal of or premium, if any, or interest on the Securities
need not be made on such date but may be made on the next succeeding Business
Day (and without any interest or other payment in respect of any such delay),
with the same force and effect as if made on the date of payment and no interest
shall accrue for the period from and after such date.


                                       85




                  SECTION 13.08.  Trust Indenture Act to Control.

                  If and to the extent that any provision of this Indenture
limits, qualifies or conflicts with another provision included in this Indenture
which is required to be included in this Indenture by any of Sections 310 to
317, inclusive, of the Trust Indenture Act of 1939, such required provision
shall control.

                  SECTION 13.09.  Table of Contents, Headings, etc.

                  The table of contents and the titles and headings of the
articles and sections of this Indenture have been inserted for convenience of
reference only, are not to be considered a part hereof, and shall in no way
modify or restrict any of the terms or provisions hereof.

                  SECTION 13.10.  Execution in Counterparts

                  This Indenture may be executed in any number of counterparts,
each of which shall be an original, but such counterparts shall together
constitute but one and the same instrument.

                  SECTION 13.11.  Separability.

                  In case any one or more of the provisions contained in this
Indenture or in the Securities shall for any reason be held to be invalid,
illegal or unenforceable in any respect, such invalidity, illegality or
unenforceability shall not affect any other provisions of this Indenture or of
the Securities, but this Indenture and the Securities shall be construed as if
such invalid or illegal or unenforceable provision had never been contained
herein or therein.

                                       86




                  SECTION 13.12.  Assignment.

                  The Company will have the right at all times to assign any of
its respective rights or obligations under this Indenture to a direct or
indirect wholly owned Subsidiary of the Company, provided that, in the event of
any such assignment, the Company, as the case may be, will remain liable for all
such obligations. Subject to the foregoing, the Indenture is binding upon and
inures to the benefit of the parties thereto and their respective successors and
assigns. This Indenture may not otherwise be assigned by the parties hereto.

                  SECTION 13.13.  Acknowledgement of Rights.

                  The Company acknowledges that, with respect to any Securities
held by Markel Capital Trust or a trustee of such trust, if the Property Trustee
of such Trust fails to enforce its rights under this Indenture as the holder of
the Securities held as the assets of Markel Capital Trust any holder of Capital
Securities may institute legal proceedings directly against the Company to
enforce such Property Trustee's rights under this Indenture without first
instituting any legal proceedings against such Property Trustee or any other
Person. Notwithstanding the foregoing, if an Event of Default has occurred and
is continuing and such event is attributable to the failure of the Company to
pay principal of or premium, if any, or interest on the Securities when due, the
Company acknowledges that a holder of Capital Securities may directly institute
a proceeding for enforcement of payment to such holder of the principal of or
premium, if any, or interest on the Securities having a principal amount equal
to the aggregate liquidation amount of the Capital Securities of such holder on
or after the respective due date specified in the Securities.

                                  ARTICLE XIV.
                    PREPAYMENT OF SECURITIES -- MANDATORY AND
                              OPTIONAL SINKING FUND

                  SECTION 14.01.  Special Event Prepayment.

                  If a Special Event has occurred and is continuing, then the
Company shall have the right, prior to the Initial Optional Prepayment Date,
notwithstanding Section 14.02(a) but subject to Section 14.02(b), upon (i) not


                                       87





less than 45 days written notice to the Trustee and (ii) not less than 30 days
nor more than 60 days written notice to the Securityholders, to prepay the
Securities, in whole (but not in part), at any time within 90 days following the
occurrence of such Special Event, at the Special Event Prepayment Price.
Following a Special Event, the Company shall take such action as is necessary to
promptly determine the Special Event Prepayment Price, including without
limitation the appointment by the Company of a Quotation Agent. The Special
Event Prepayment Price shall be paid prior to 12:00 noon, New York City time, on
the date of such prepayment or such earlier time as the Company determines,
provided that the Company shall deposit with the Trustee an amount sufficient to
pay the Special Event Prepayment Price by 10:00 a.m., New York City time, on the
date such Special Event Prepayment Price is to be paid.

                  SECTION 14.02.  Optional Prepayment by Company.

                  (a) Subject to the provisions of this Article XIV, the Company
shall have the right to prepay the Securities, in whole or in part, from time to
time, on or after the Initial Optional Prepayment Date, at the optional
prepayment prices set forth below (expressed as percentages of outstanding
principal amount of the Securities to be prepaid), plus, in each case, accrued
and unpaid interest thereon (including Additional Sums and Compounded Interest,
if any) to the applicable date of prepayment (the "Optional Prepayment Price")
if prepaid during the 12-month period beginning January 1 of the years indicated
below.

                  Year                          Percentage
                  ----                          ----------

                  2007.......................... 104.355%
                  2008.......................... 103.920
                  2009.......................... 103.484
                  2010.......................... 103.049
                  2011.......................... 102.613
                  2012.......................... 102.178
                  2013.......................... 101.742
                  2014.......................... 101.307
                  2015.......................... 100.871
                  2016.......................... 100.436
                  2017 and thereafter............100.000%


                                       88







                  If the Securities are only partially prepaid pursuant to this
Section 14.02, the Securities will be prepaid pro rata or by lot or by any other
method utilized by the Trustee; provided that if at the time of prepayment, the
Securities are registered as a Global Security, the Depositary shall determine
in accordance with its procedures the principal amount of Securities held for
the account of its participants to be prepaid. The Optional Prepayment Price
shall be paid prior to 12:00 noon, New York City time, on the date of such
prepayment or at such earlier time as the Company determines, provided that the
Company shall deposit with the Trustee an amount sufficient to pay the Optional
Prepayment Price by 10:00 a.m., New York City time, on the date such Optional
Prepayment Price is to be paid.

                  (b) Notwithstanding the first sentence of Section 14.02, upon
the entry of an order for dissolution of Markel Capital Trust by a court of
competent jurisdiction, the Securities thereafter will be subject to optional
prepayment, in whole only, but not in part, on or after the Initial Optional
Prepayment Date, at the optional prepayment prices set forth in Section 14.02
and otherwise in accordance with this Article XIV.

                  SECTION 14.03.  No Sinking Fund.

                  The Securities are not entitled to the benefit of any sinking
fund.

                  SECTION 14.04.    Notice of Prepayment; Selection of
                                    Securities.

                  In case the Company shall desire to exercise the right to
prepay all, or, as the case may be, any part of the Securities in accordance
with their terms, it shall fix a date for prepayment and shall mail a notice of
such prepayment at least 30 and not more than 60 days prior to the date fixed
for prepayment to the holders of Securities so to be prepaid as a whole or in
part at their last addresses as the same appear on the Security Register. Such
mailing shall be by first class mail. The notice if mailed in the manner herein
provided shall be conclusively presumed to have been duly given, whether or not
the holder receives such notice. In any case, failure to give such notice by
mail or any defect in the notice to the holder of any Security designated for
prepayment as a whole or in part shall not affect the validity of the
proceedings for the prepayment of any other Security.



                                       89






                  Each such notice of prepayment shall specify the CUSIP number
of the Securities to be prepaid, the date fixed for prepayment, the prepayment
price at which the Securities are to be prepaid (or the method by which such
prepayment price is to be calculated), the place or places of payment that
payment will be made upon presentation and surrender of the Securities, that
interest accrued to the date fixed for prepayment will be paid as specified in
said notice, and that on and after said date interest thereon or on the portions
thereof to be prepaid will cease to accrue. If less than all the Securities are
to be prepaid the notice of prepayment shall specify the numbers of the
Securities to be prepaid. In case any Security is to be prepaid in part only,
the notice of prepayment shall state the portion of the principal amount thereof
to be prepaid and shall state that on and after the date fixed for prepayment,
upon surrender of such Security, a new Security or Securities in principal
amount equal to the unprepaid portion thereof will be issued.

                  Prior to 10:00 a.m., New York City time, on the prepayment
date specified in the notice of prepayment given as provided in this Section,
the Company will deposit with the Trustee or with one or more paying agents an
amount of money sufficient to prepay on the prepayment date all the Securities
so called for prepayment at the appropriate Prepayment Price, together with
accrued interest to the date fixed for prepayment.

                  The Company will give the Trustee notice not less than 45 days
prior to the prepayment date as to the aggregate principal amount of Securities
to be prepaid and the Trustee shall select, in such manner as in its sole
discretion it shall deem appropriate and fair, the Securities or portions
thereof (in integral multiples of $1,000, except as otherwise set forth in the
applicable form of Security) to be prepaid.

                                       90





                  SECTION 14.05.    Payment of Securities Called for
                                    Prepayment.

                  If notice of prepayment has been given as provided in Section
14.04, the Securities or portions of Securities with respect to which such
notice has been given shall become due and payable on the date and at the place
or places stated in such notice at the applicable Prepayment Price, together
with interest accrued to the date fixed for prepayment (subject to the rights of
holders of Securities on the close of business on a regular record date in
respect of an Interest Payment Date occurring on or prior to the prepayment
date), and on and after said date (unless the Company shall default in the
payment of such Securities at the Prepayment Price, together with interest
accrued to said date) interest on the Securities or portions of Securities so
called for prepayment shall cease to accrue. On presentation and surrender of
such Securities at a place of payment specified in said notice, the said
Securities or the specified portions thereof shall be paid and prepaid by the
Company at the applicable Prepayment Price, together with interest accrued
thereon to the date fixed for prepayment (subject to the rights of holders of
Securities on the close of business on a regular record date in respect of an
Interest Payment Date occurring on or prior to the prepayment date).

                  Upon presentation of any Security prepaid in part only, the
Company shall execute and the Trustee shall authenticate and make available for
delivery to the holder thereof, at the expense of the Company, a new Security or
Securities of authorized denominations, in principal amount equal to the
unprepaid portion of the Security so presented.

                  SECTION 14.06.  Conditional Right to Advance Maturity.

         If a Tax Event occurs, then the Company will have the right (i) prior
to the termination of Markel Capital Trust, to advance the Maturity Date of the
Securities to the minimum extent required, but not to a date earlier than twenty
years from the Issue Date, or (ii) to terminate Markel Capital Trust (if not
previously terminated) and advance the Maturity Date of the Securities to the
minimum extent required, but not to a date earlier than forty years from the

                                       91




Issue Date, in each case such that, in the written opinion of counsel
experienced in such matters delivered to the Company, after advancing the
Maturity Date, interest paid on the Securities shall be deductible for federal
income tax purposes (the action referred to in either clause (i) of (ii) above
being referred to herein as a "Tax Event Maturity Advancement").

         If a Tax Event occurs and in the written opinion of counsel to the
Company experienced in such matters there would in all cases, after effecting a
Tax Event Maturity Advancement, be more than an insubstantial risk that an
Adverse Tax Consequence would continue to exist, a Special Event shall be deemed
to have occurred and the Securities shall then be subject to prepayment in
accordance with the provisions of Section 14.01. The circumstances under which
the Company has the right to prepay the Securities in connection with a Tax
Event is referred to herein as a "Conditional Tax Redemption Event".


                                   ARTICLE XV.

                           SUBORDINATION OF SECURITIES

                  SECTION 15.01.  Agreement to Subordinate.

                  The Company covenants and agrees, and each holder of
Securities issued hereunder likewise covenants and agrees, that the Securities
shall be issued subject to the provisions of this Article XV; and each holder of
a Security, whether upon original issue or upon transfer or assignment thereof,
accepts and agrees to be bound by such provisions.

                  The payment by the Company of the principal of and premium, if
any, and interest on all Securities issued hereunder shall, to the extent and in
the manner hereinafter set forth, be subordinated and junior in right of payment
to the prior payment in full of all amounts with respect to Senior Indebtedness,
whether outstanding at the date of this Indenture or thereafter incurred.


                                       92





                  No provision of this Article XV shall prevent the occurrence
of any Default or Event of Default hereunder.

                  SECTION 15.02.  Default on Senior Indebtedness.

                  In the event and during the continuation of any default by the
Company in the payment of principal, premium, interest or any other payment due
on any Senior Indebtedness, or in the event that the maturity of any Senior
Indebtedness has been accelerated because of a default, then, in either case, no
payment shall be made by the Company with respect to the principal (including
prepayments) of or premium, if any, or interest on the Securities.

                  In the event of the acceleration of the maturity of the
Securities, then no payment shall be made by the Company with respect to the
principal (including prepayments) of or premium, if any, or interest on the
Securities until the holders of all Senior Indebtedness outstanding at the time
of such acceleration shall receive payment in full of all amounts due in respect
of such Senior Indebtedness (including any amounts due upon acceleration).

                  In the event that, notwithstanding the foregoing, any payment
shall be received by the Trustee when such payment is prohibited by the
preceding paragraph of this Section 15.02, such payment shall be held in trust
for the benefit of, and shall be paid over or delivered to, the holders of
Senior Indebtedness or their respective representatives, or to the trustee or
trustees under any indenture pursuant to which any of such Senior Indebtedness
may have been issued, as their respective interests may appear, but only to the
extent of the amounts due in respect of such Senior Indebtedness and only to the
extent that the holders of the Senior Indebtedness (or their representative or
representatives or a trustee) notify the Trustee in writing, within 90 days of
such payment, of the amounts then due and owing on such Senior Indebtedness and
only the amounts specified in such notice to the Trustee shall be paid to the
holders of such Senior Indebtedness.


                                       93




                  SECTION 15.03.  Liquidation; Dissolution; Bankruptcy.

                  Upon any payment by the Company or distribution of assets of
the Company of any kind or character, whether in cash, property or securities,
to creditors upon any dissolution or winding-up or liquidation or reorganization
of the Company, whether voluntary or involuntary or in bankruptcy, insolvency,
receivership or other proceedings, all amounts due upon all Senior Indebtedness
of the Company shall first be paid in full, or payment thereof provided for in
money in accordance with its terms, before any payment is made by the Company on
account of the principal (and premium, if any) or interest on the Securities;
and upon any such dissolution or winding-up or liquidation or reorganization,
any payment by the Company, or distribution of assets of the Company of any kind
or character, whether in cash, property or securities, to which the
Securityholders or the Trustee would be entitled to receive from the Company,
except for the provisions of this Article XV, shall be paid by the Company or by
any receiver, trustee in bankruptcy, liquidating trustee, agent or other Person
making such payment or distribution, or by the Securityholders or by the Trustee
under this Indenture if received by them or it, directly to the holders of
Senior Indebtedness of the Company (pro rata to such holders on the basis of the
respective amounts of Senior Indebtedness held by such holders, as calculated by
the Company) or their representative or representatives, or to the trustee or
trustees under any indenture pursuant to which any instruments evidencing such
Senior Indebtedness may have been issued, as their respective interests may
appear, to the extent necessary to pay such Senior Indebtedness in full, in
money or money's worth, after giving effect to any concurrent payment or
distribution to or for the holders of such Senior Indebtedness, before any
payment or distribution is made to the Securityholders or to the Trustee.

                  In the event that, notwithstanding the foregoing, any payment
or distribution of assets of the Company of any kind or character, whether in
cash, property or securities, prohibited by the foregoing, shall be received by
the Trustee before all Senior Indebtedness is paid in full, or provision is made
for such payment in money in accordance with its terms, such payment or
distribution shall be held in trust for the benefit of and shall be paid over or


                                       94





delivered to the holders of such Senior Indebtedness or their representative or
representatives, or to the trustee or trustees under any indenture pursuant to
which any instruments evidencing such Senior Indebtedness may have been issued,
and their respective interests may appear, as calculated by the Company, for
application to the payment of all Senior Indebtedness remaining unpaid to the
extent necessary to pay all amounts due in respect of such Senior Indebtedness
in full in money in accordance with its terms, after giving effect to any
concurrent payment or distribution to or for the benefit of the holders of such
Senior Indebtedness.

                  For purposes of this Article XV, the words "cash, property or
securities" shall not be deemed to include shares of stock of the Company as
reorganized or readjusted, or securities of the Company or any other corporation
provided for by a plan of reorganization or readjustment, the payment of which
is subordinated at least to the extent provided in this Article XV with respect
to the Securities to the payment of Senior Indebtedness that may at the time be
outstanding, provided that (i) such Senior Indebtedness is assumed by the new
corporation, if any, resulting from any such reorganization or readjustment, and
(ii) the rights of the holders of such Senior Indebtedness are not, without the
consent of such holders, altered by such reorganization or readjustment. The
consolidation of the Company with, or the merger of the Company into, another
Person or the liquidation or dissolution of the Company following the sale,
conveyance, transfer or lease of its property as an entirety, or substantially
as an entirety, to another Person upon the terms and conditions provided for in
Article X of this Indenture shall not be deemed a dissolution, winding-up,
liquidation or reorganization for the purposes of this Section 15.03 if such
other Person shall, as a part of such consolidation, merger, sale, conveyance,
transfer or lease, comply with the conditions stated in Article X of this
Indenture. Nothing in Section 15.02 or in this Section 15.03 shall apply to
claims of, or payments to, the Trustee under or pursuant to Section 6.06 of this
Indenture.

                                       95




                  SECTION 15.04.  Subrogation.

                  Subject to the payment in full of all amounts due in respect
of Senior Indebtedness, the rights of the Securityholders shall be subrogated to
the rights of the holders of such Senior Indebtedness to receive payments or
distributions of cash, property or securities of the Company, as the case may
be, applicable to such Senior Indebtedness until the principal of (and premium,
if any) and interest on the Securities shall be paid in full; and, for the
purposes of such subrogation, no payments or distributions to the holders of
such Senior Indebtedness of any cash, property or securities to which the
Securityholders or the Trustee would be entitled except for the provisions of
this Article XV, and no payment over pursuant to the provisions of this Article
XV to or for the benefit of the holders of such Senior Indebtedness by
Securityholders or the Trustee, shall, as between the Company, its creditors
other than holders of Senior Indebtedness of the Company, and the holders of the
Securities, be deemed to be a payment by the Company to or on account of such
Senior Indebtedness. It is understood that the provisions of this Article XV are
and are intended solely for the purposes of defining the relative rights of the
holders of the Securities, on the one hand, and the holders of such Senior
Indebtedness, on the other hand.

                  Nothing contained in this Article XV or elsewhere in this
Indenture or in the Securities is intended to or shall impair, as between the
Company, its creditors other than the holders of Senior Indebtedness of the
Company, and the holders of the Securities, the obligation of the Company, which
is absolute and unconditional, to pay to the holders of the Securities the
principal of (and premium, if any) and interest on the Securities as and when
the same shall become due and payable in accordance with their terms, or is
intended to or shall affect the relative rights of the holders of the Securities
and creditors of the Company, as the case may be, other than the holders of
Senior Indebtedness of the Company, as the case may be, nor shall anything
herein or therein prevent the Trustee or the holder of any Security from
exercising all remedies otherwise permitted by applicable law upon default under
this Indenture, subject to the rights, if any, under this Article XV of the
holders of such Senior Indebtedness in respect of cash, property or securities
of the Company, as the case may be, received upon the exercise of any such
remedy.


                                       96






                  Upon any payment or distribution of assets of the Company
referred to in this Article XV, the Trustee, subject to the provisions of
Article VI of this Indenture, and the Securityholders shall be entitled to
conclusively rely upon any order or decree made by any court of competent
jurisdiction in which such dissolution, winding-up, liquidation or
reorganization proceedings are pending, or a certificate of the receiver,
trustee in bankruptcy, liquidation trustee, agent or other Person making such
payment or distribution, delivered to the Trustee or to the Securityholders, for
the purposes of ascertaining the Persons entitled to participate in such
distribution, the holders of Senior Indebtedness and other indebtedness of the
Company, as the case may be, the amount thereof or payable thereon, the amount
or amounts paid or distributed thereon and all other facts pertinent thereto or
to this Article XV.


                  SECTION 15.05.    Trustee to Effectuate Subordination.

                  Each Securityholder by such Securityholder's acceptance
thereof authorizes and directs the Trustee on such Securityholder's behalf to
take such action as may be necessary or appropriate to effectuate the
subordination provided in this Article XV and appoints the Trustee such
Securityholder's attorney-in-fact for any and all such purposes.

                  SECTION 15.06.  Notice by the Company.

                  The Company shall give prompt written notice to a Responsible
Officer of the Trustee of any fact known to the Company that would prohibit the
making of any payment of monies to or by the Trustee in respect of the
Securities pursuant to the provisions of this Article XV. Notwithstanding the
provisions of this Article XV or any other provision of this Indenture, the
Trustee shall not be charged with knowledge of the existence of any facts that
would prohibit the making of any payment of monies to or by the Trustee in
respect of the Securities pursuant to the provisions of this Article XV, unless


                                       97




and until a Responsible Officer of the Trustee shall have received written
notice thereof from the Company or a holder or holders of Senior Indebtedness or
from any trustee therefor; and before the receipt of any such written notice,
the Trustee, subject to the provisions of Article VI of this Indenture, shall be
entitled in all respects to assume that no such facts exist; provided, however,
that if the Trustee shall not have received the notice provided for in this
Section 15.06 at least two Business Days prior to the date upon which by the
terms hereof any money may become payable for any purpose (including, without
limitation, the payment of the principal of (or premium, if any) or interest on
any Security), then, anything herein contained to the contrary notwithstanding,
the Trustee shall have full power and authority to receive such money and to
apply the same to the purposes for which they were received, and shall not be
affected by any notice to the contrary that may be received by it within two
Business Days prior to such date.

                  The Trustee, subject to the provisions of Article VI of this
Indenture, shall be entitled to conclusively rely on the delivery to it of a
written notice by a Person representing himself to be a holder of Senior
Indebtedness of the Company, as the case may be (or a trustee on behalf of such
holder), to establish that such notice has been given by a holder of such Senior
Indebtedness or a trustee on behalf of any such holder or holders. In the event
that the Trustee determines in good faith that further evidence is required with
respect to the right of any Person as a holder of such Senior Indebtedness to
participate in any payment or distribution pursuant to this Article XV, the
Trustee may request such Person to furnish evidence to the reasonable
satisfaction of the Trustee as to the amount of such Senior Indebtedness held by
such Person, the extent to which such Person is entitled to participate in such
payment or distribution and any other facts pertinent to the rights of such
Person under this Article XV, and, if such evidence is not furnished, the
Trustee may defer any payment to such Person pending judicial determination as
to the right of such Person to receive such payment.

                                       98





                  Upon any payment or distribution of assets of the Company
referred to in this Article XV, the Trustee and the Securityholders shall be
entitled to rely upon any order or decree entered by any court of competent
jurisdiction in which such insolvency, bankruptcy, receivership, liquidation,
reorganization, dissolution, winding up or similar case or proceeding is
pending, or a certificate of the trustee in bankruptcy, liquidating trustee,
custodian, receiver, assignee for the benefit of creditors, agent or other
Person making such payment or distribution, delivered to the Trustee or to the
Securityholders, for the purpose of ascertaining the Persons entitled to
participate in such payment or distribution, the holders of Senior Indebtedness
and other indebtedness of the Company, the amount thereof or payable thereon,
the amount or amounts paid or distributed thereon and all other facts pertinent
thereto or to this Article XV.


                  SECTION 15.07.    Rights of the Trustee; Holders of Senior
                                    Indebtedness.

                  The Trustee in its individual capacity shall be entitled to
all the rights set forth in this Article XV in respect of any Senior
Indebtedness at any time held by it, to the same extent as any other holder of
Senior Indebtedness, and nothing in this Indenture shall deprive the Trustee of
any of its rights as such holder.

                  With respect to the holders of Senior Indebtedness of the
Company, the Trustee undertakes to perform or to observe only such of its
covenants and obligations as are specifically set forth in this Article XV, and
no implied covenants or obligations with respect to the holders of such Senior
Indebtedness shall be read into this Indenture against the Trustee. The Trustee
shall not be deemed to owe any fiduciary duty to the holders of such Senior
Indebtedness and, subject to the provisions of Article VI of this Indenture, the
Trustee shall not be liable to any holder of such Senior Indebtedness if it
shall pay over or deliver to Securityholders, the Company or any other Person
money or assets to which any holder of such Senior Indebtedness shall be
entitled by virtue of this Article XV or otherwise.

                  Nothing in this Article XV shall apply to claims of, or
payments to, the Trustee under or pursuant to Section 6.06.





                                       99





                  SECTION 15.08.  Subordination May Not Be Impaired.

                  No right of any present or future holder of any Senior
Indebtedness of the Company to enforce subordination as herein provided shall at
any time in any way be prejudiced or impaired by any act or failure to act on
the part of the Company or by any act or failure to act, in good faith, by any
such holder, or by any noncompliance by the Company with the terms, provisions
and covenants of this Indenture, regardless of any knowledge thereof that any
such holder may have or otherwise be charged with.

                  Without in any way limiting the generality of the foregoing
paragraph, the holders of Senior Indebtedness of the Company may, at any time
and from time to time, without the consent of or notice to the Trustee or the
Securityholders, without incurring responsibility to the Securityholders and
without impairing or releasing the subordination provided in this Article XV or
the obligations hereunder of the holders of the Securities to the holders of
such Senior Indebtedness, do any one or more of the following: (i) change the
manner, place or terms of payment or extend the time of payment of, or renew or
alter, such Senior Indebtedness, or otherwise amend or supplement in any manner
such Senior Indebtedness or any instrument evidencing the same or any agreement
under which such Senior Indebtedness is outstanding; (ii) sell, exchange,
release or otherwise deal with any property pledged, mortgaged or otherwise
securing such Senior Indebtedness; (iii) release any Person liable in any manner
for the collection of such Senior Indebtedness; and (iv) exercise or refrain
from exercising any rights against the Company and any other Person.


                                  ARTICLE XVI.
                      EXTENSION OF INTEREST PAYMENT PERIOD

                  SECTION 16.01.  Extension of Interest Payment Period.

                  (a) So long as no Event of Default has occurred and is
continuing, the Company shall have the right, at any time and from time to time
during the term of the Securities, to defer payments of interest by extending
the interest payment period of such Securities for a period not exceeding 10


                                      100




consecutive semi-annual periods, including the first such semi-annual period
during such extension period (the "Extended Interest Payment Period"), during
which Extended Interest Payment Period no interest shall be due and payable;
provided that no Extended Interest Payment Period may extend beyond the Maturity
Date. To the extent permitted by applicable law, interest, the payment of which
has been deferred because of the extension of the interest payment period
pursuant to this Section 16.01, will bear interest thereon at the Coupon Rate
compounded semi-annually for each semi-annual period of the Extended Interest
Payment Period ("Compounded Interest"). At the end of the Extended Interest
Payment Period, the Company shall pay all interest accrued and unpaid on the
Securities, including any Additional Sums and Compounded Interest (together,
"Deferred Interest") that shall be payable to the holders of the Securities in
whose names the Securities are registered in the Security Register on the first
record date after the end of the Extended Interest Payment Period.

         (b) Before the termination of any Extended Interest Payment Period, the
Company may further defer payments of interest by further extending such period,
provided that such period, together with all such previous and further
extensions within such Extended Interest Payment Period, shall not exceed 10
consecutive semi-annual periods, including the first such semi-annual period
during such Extended Interest Payment Period, or extend beyond the Maturity Date
of the Securities. Upon the termination of any Extended Interest Payment Period
and the payment of all Deferred Interest then due, the Company may elect to
commence a new Extended Interest Payment Period, subject to the foregoing
requirements. No interest shall be due and payable during an Extended Interest
Payment Period, except at the end thereof, but the Company may prepay at any
time all or any portion of the interest accrued during an Extended Interest
Payment Period.

                                      101




                  SECTION 16.02.  Notice of Extension.

                  (a) If the Property Trustee is the only registered holder of
the Securities at the time the Company selects an Extended Interest Payment
Period, the Company shall give written notice to the Administrative Trustees,
the Property Trustee and the Trustee of its selection of such Extended Interest
Payment Period at least five Business Days before the earlier of (i) the next
succeeding date on which distributions on the Trust Securities issued by Markel
Capital Trust would have been payable except for such election, or (ii) the date
the Administrative Trustees are required to give notice of the record date, or
the date such Distributions are payable, to any national securities exchange or
to holders of the Capital Securities issued by Markel Capital Trust, but in any
event at least five Business Days before such record date.

                  (b) If the Property Trustee is not the only holder of the
Securities at the time the Company selects an Extended Interest Payment Period,
the Company shall give the holders of the Securities and the Trustee written
notice of its selection of such Extended Interest Payment Period at least 10
Business Days before the earlier of (i) the next succeeding Interest Payment
Date, or (ii) the date the Company is required to give notice of the record or
payment date of such interest payment to any national securities exchange.

                  (c) The semi-annual period in which any notice is given
pursuant to paragraphs (a) or (b) of this Section 16.02 shall be counted as one
of the 10 semi-annual periods permitted in the maximum Extended Interest Payment
Period permitted under Section 16.01. There is no limitation on the number of
times that the Company may elect to begin an Extended Interest Payment Period.

                  The Chase Manhattan Bank hereby accepts the trusts in this
Indenture declared and provided, upon the terms and conditions hereinabove set
forth.



                                      102






                  IN WITNESS WHEREOF, the parties hereto have caused this
Indenture to be duly executed by their respective officers thereunto duly
authorized, as of the day and year first above written.

                                                     MARKEL CORPORATION


                                                     By /s/ DARRELL D. MARTIN
                                                     ------------------------
                                                     Name: Darrell D. Martin
                                                     Title: EVP/CFO



                                                     THE CHASE MANHATTAN BANK,
                                                     as Trustee


                                                     By /s/ C. J. HEINZELMANN
                                                     ------------------------
                                                     Name:  C. J. Heinzelmann
                                                     Title: Vice President









                                    EXHIBIT A

                           (FORM OF FACE OF SECURITY)

                  [IF THE SECURITY IS A GLOBAL SECURITY, INSERT: - THIS SECURITY
IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO
AND IS REGISTERED IN THE NAME OF A DEPOSITARY OR A NOMINEE OF A DEPOSITARY. THIS
SECURITY IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER
THAN THE DEPOSITARY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED
IN THE INDENTURE, AND NO TRANSFER OF THIS SECURITY (OTHER THAN A TRANSFER OF
THIS SECURITY AS A WHOLE BY THE DEPOSITARY TO A NOMINEE OF THE DEPOSITARY OR BY
A NOMINEE OF THE DEPOSITARY TO THE DEPOSITARY OR ANOTHER NOMINEE OF THE
DEPOSITARY) MAY BE REGISTERED EXCEPT IN LIMITED CIRCUMSTANCES.

                  UNLESS THIS SECURITY IS PRESENTED BY AN AUTHORIZED
REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION ("DTC")
TO THE ISSUER OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT,
AND ANY SECURITY ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER
NAME AS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF THE DTC (AND ANY PAYMENT
HEREON IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN
AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR
VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL SINCE THE REGISTERED OWNER
HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.]

                  THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT
OF 1933, AS AMENDED (THE "SECURITIES ACT"), OR ANY STATE SECURITIES LAWS OR ANY
OTHER APPLICABLE SECURITIES LAW. NEITHER THIS SECURITY NOR ANY INTEREST OR
PARTICIPATION HEREIN MAY BE REOFFERED, SOLD, ASSIGNED, TRANSFERRED, PLEDGED,
ENCUMBERED OR OTHERWISE DISPOSED OF IN THE ABSENCE OF SUCH REGISTRATION OR
UNLESS SUCH TRANSACTION IS EXEMPT FROM, OR NOT SUBJECT TO, REGISTRATION.


                                      104





                  THE HOLDER OF THIS SECURITY BY ITS ACCEPTANCE HEREOF AGREES TO
OFFER, SELL OR OTHERWISE TRANSFER THIS SECURITY, PRIOR TO THE DATE (THE "RESALE
RESTRICTION TERMINATION DATE") WHICH IS THREE YEARS AFTER THE LATER OF THE
ORIGINAL ISSUANCE DATE HEREOF AND THE LAST DATE ON WHICH THE COMPANY OR ANY
"AFFILIATE" OF THE COMPANY WAS THE OWNER OF THIS SECURITY (OR ANY PREDECESSOR OF
THIS SECURITY) ONLY (A) TO THE COMPANY, (B) PURSUANT TO A REGISTRATION STATEMENT
WHICH HAS BEEN DECLARED EFFECTIVE UNDER THE SECURITIES ACT, (C) SO LONG AS THIS
SECURITY IS ELIGIBLE FOR RESALE PURSUANT TO RULE 144A UNDER THE SECURITIES ACT
("RULE 144A"), TO A PERSON IT REASONABLY BELIEVES IS A "QUALIFIED INSTITUTIONAL
BUYER" (AS DEFINED IN RULE 144A) THAT PURCHASES FOR ITS OWN ACCOUNT OR FOR THE
ACCOUNT OF A QUALIFIED INSTITUTIONAL BUYER TO WHOM NOTICE IS GIVEN THAT THE
TRANSFER IS BEING MADE IN RELIANCE ON RULE 144A, (D) PURSUANT TO OFFERS AND
SALES TO NON-U.S. PERSONS THAT OCCUR OUTSIDE THE UNITED STATES WITHIN THE
MEANING OF REGULATION S UNDER THE SECURITIES ACT, (E) TO AN INSTITUTIONAL
"ACCREDITED INVESTOR" WITHIN THE MEANING OF SUBPARAGRAPH (A)(1), (2), (3) OR (7)
OF RULE 501 UNDER THE SECURITIES ACT THAT IS ACQUIRING THIS SECURITY FOR ITS OWN
ACCOUNT, OR FOR THE ACCOUNT OF SUCH AN INSTITUTIONAL ACCREDITED INVESTOR, FOR
INVESTMENT PURPOSES AND NOT WITH A VIEW TO, OR FOR OFFER OR SALE IN CONNECTION
WITH, ANY DISTRIBUTION IN VIOLATION OF THE SECURITIES ACT, OR (F) PURSUANT TO
ANY OTHER AVAILABLE EXEMPTION FROM THE REGISTRATION REQUIREMENTS UNDER THE
SECURITIES ACT, SUBJECT TO THE RIGHT OF THE COMPANY PRIOR TO ANY SUCH OFFER,
SALE OR TRANSFER (i) PURSUANT TO CLAUSE (D), (E) OR (F) TO REQUIRE THE DELIVERY
OF AN OPINION OF COUNSEL, CERTIFICATIONS AND/OR OTHER INFORMATION SATISFACTORY
TO THE COMPANY, AND (ii) PURSUANT TO CLAUSE (E), TO REQUIRE THAT A CERTIFICATE
OF TRANSFER IN THE FORM APPEARING ON THE REVERSE OF THIS SECURITY IS COMPLETED
AND DELIVERED BY THE TRANSFEREE TO THE COMPANY. SUCH HOLDER FURTHER AGREES THAT
IT WILL DELIVER TO EACH PERSON TO WHOM THIS SECURITY IS TRANSFERRED A NOTICE
SUBSTANTIALLY TO THE EFFECT OF THIS LEGEND.

                  THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT
AND MAY NOT BE OFFERED OR SOLD WITHIN THE UNITED STATES OR TO, OR FOR THE
ACCOUNT OR BENEFIT OF, U.S. PERSONS UNLESS REGISTERED UNDER THE SECURITIES ACT
OR AN EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT IS
AVAILABLE.



No.                                                   CUSIP No.





                                      105





                               MARKEL CORPORATION
        8.71% SERIES _ JUNIOR SUBORDINATED DEFERRABLE INTEREST DEBENTURE
                              DUE JANUARY 1, 2046

                  Markel Corporation, a Virginia corporation (the "Company",
which term includes any successor Person under the Indenture hereinafter
referred to), for value received, hereby promises to pay to __________, or
registered assigns, the principal sum of $__________ Dollars on January 1, 2046,
or on such earlier date as the Company shall determine pursuant to Section 14.06
of the Indenture (the "Maturity Date"), unless previously prepaid, and to pay
interest on the outstanding principal amount hereof from January 13, 1997, or
from the most recent interest payment date (each such date, an "Interest Payment
Date") to which interest has been paid or duly provided for, semi-annually
(subject to deferral as set forth herein) in arrears on January 1 and July 1 of
each year, commencing July 1, 1997, at the rate of 8.71% per annum until the
principal hereof shall have become due and payable, and on any overdue principal
and premium, if any, and (without duplication and to the extent that payment of
such interest is enforceable under applicable law) on any overdue installment of
interest at the same rate per annum compounded semi-annually. The amount of
interest payable on any Interest Payment Date shall be computed on the basis of
a 360-day year of twelve 30-day months and, for any period less than a full
calendar month, the number of days elapsed in such month. In the event that any
date on which the principal of (or premium, if any) or interest on this Security
is payable is not a Business Day, then payment payable on such date will be made
on the next succeeding day that is a Business Day (and without any interest or
other payment in respect of any such delay), with the same force and effect as
if made on such date.

                  The interest installment so payable, and punctually paid or
duly provided for, on any Interest Payment Date will, as provided in the
Indenture, be paid to the Person in whose name this Security (or one or more
Predecessor Securities, as defined in said Indenture) is registered at the close
of business on the regular record date for such interest installment, which
shall be the date fifteen days prior to the relevant Interest Payment Date. Any



                                      106





such interest installment not punctually paid or duly provided for shall
forthwith cease to be payable to the holders on such regular record date and may
be paid to the Person in whose name this Security (or one or more Predecessor
Securities) is registered at the close of business on a special record date to
be fixed by the Trustee for the payment of such defaulted interest, notice
whereof shall be given to the holders of Securities not less than 10 days prior
to such special record date, or may be paid at any time in any other lawful
manner not inconsistent with the requirements of any securities exchange on
which the Securities may be listed, and upon such notice as may be required by
such exchange, all as more fully provided in the Indenture.

                  The principal of (and premium, if any) and interest on this
Security shall be payable at the office or agency of the Trustee in New York,
New York maintained for that purpose in any coin or currency of the United
States of America that at the time of payment is legal tender for payment of
public and private debts; provided, however, that, payment of interest may be
made at the option of the Company by (i) check mailed to the holder at such
address as shall appear in the Security Register or (ii) by transfer to an
account maintained by the Person entitled thereto, provided that proper written
transfer instructions have been received by the relevant record date; provided
that if this Security is in global form, the interest hereon shall be made in
immediately available funds. Notwithstanding the foregoing, so long as the
Holder of this Security is the Property Trustee, the payment of the principal of
(and premium, if any) and interest on this Security will be made at such place
and to such account as may be designated by the Property Trustee.

                  The indebtedness evidenced by this Security is, to the extent
provided in the Indenture, subordinate and junior in right of payment to the
prior payment in full of Senior Indebtedness, and this Security is issued
subject to the provisions of the Indenture with respect thereto. Each holder of
this Security, by accepting the same, (a) agrees to and shall be bound by such
provisions, (b) authorizes and directs the Trustee on his or her behalf to take
such action as may be necessary or appropriate to acknowledge or effectuate the
subordination so provided and (c) appoints the Trustee his or her
attorney-in-fact for any and all such purposes. Each holder hereof, by his or
her acceptance hereof, hereby waives all notice of the acceptance of the
subordination provisions contained herein and in the Indenture by each holder of
Senior Indebtedness, whether now outstanding or hereafter incurred, and waives
reliance by each such holder upon said provisions.

                                      107





                  This Security shall not be entitled to any benefit under the
Indenture hereinafter referred to, be valid or become obligatory for any purpose
until the Certificate of Authentication hereon shall have been signed by or on
behalf of the Trustee.





                                      108





                  The provisions of this Security are continued on the reverse
side hereof and such provisions shall for all purposes have the same effect as
though fully set forth at this place.

                  IN WITNESS WHEREOF, the Company has caused this instrument to
be executed.


Dated___________________

                                                     MARKEL CORPORATION

                                                     By:______________________
                                                     Name:
                                                     Title:

Attest:

By:_____________________
Name:
Title:

                     (FORM OF CERTIFICATE OF AUTHENTICATION)

                          CERTIFICATE OF AUTHENTICATION

                  This is one of the Securities referred to in the
within-mentioned Indenture.


THE CHASE MANHATTAN BANK,
as Trustee

By:_____________________
Authorized Officer






                                      109







                          (FORM OF REVERSE OF SECURITY)

                  This Security is one of the Securities of the Company (herein
sometimes referred to as the "Securities"), specified in the Indenture, all
issued or to be issued under and pursuant to an Indenture, dated as of January
13, 1997 (the "Indenture"), duly executed and delivered between the Company and
The Chase Manhattan Bank, as Trustee (the "Trustee"), to which Indenture
reference is hereby made for a description of the rights, limitations of rights,
obligations, duties and immunities thereunder of the Trustee, the Company and
the holders of the Securities.

                  Upon the occurrence and continuation of a Special Event prior
to January 1, 2007 (the "Initial Optional Prepayment Date"), the Company shall
have the right to prepay this Security in whole (but not in part) at the Special
Event Prepayment Price. "Special Event Prepayment Price" shall mean an amount in
cash equal to the greater of (i) 100% of the principal amount of the Securities
to be prepaid and (ii) the sum, as determined by a Quotation Agent, of the
present values of the principal amount of and premium payable as part of the
Optional Prepayment Price with respect to an optional prepayment of such
Securities on the Initial Optional Prepayment Date, together with scheduled
payments of interest on the Securities from the prepayment date to and including
the Initial Optional Prepayment Date discounted to the prepayment date on a
semi-annual basis (assuming a 360-day year consisting of twelve 30-day months)
at the Adjusted Treasury Rate, plus, in each case, any accrued and unpaid
interest thereon, including Compounded Interest and Additional Sums, if any, to
the date of such prepayment.

                  In addition, the Company shall have the right to prepay this
Security, in whole or in part, at any time on or after the Initial Optional
Prepayment Date (an "Optional Prepayment"), at the Optional Prepayment Prices
set forth below (expressed as percentages of the principal amount to be prepaid)
plus accrued and unpaid interest thereon (including Additional Sums and
Compounded Interest, if any) to the applicable date of prepayment if prepaid
during the 12-month period beginning January 1 of the years indicated below:

                                      110






                           Year                        Percentage

                           2007......................... 104.355%
                           2008......................... 103.920%
                           2009......................... 103.484%
                           2010......................... 103.049%
                           2011......................... 102.613%
                           2012......................... 102.178%
                           2013......................... 101.742%
                           2014......................... 101.307%
                           2015......................... 100.871%
                           2016......................... 100.436%
                           2017 and thereafter ......... 100.000%

                  The Optional Prepayment Price or the Special Event Prepayment
Price, as the case requires, shall be paid prior to 12:00 noon, New York City
time, on the date of such prepayment, provided, that the Company shall deposit
with the Trustee an amount sufficient to pay the applicable Prepayment Price by
10:00 a.m., New York City time, on the date such Prepayment Price is to be paid.
Any prepayment pursuant to this paragraph will be made upon not less than 30
days nor more than 60 days notice. If the Securities are only partially prepaid
by the Company pursuant to an Optional Prepayment, the Securities will be
prepaid pro rata or by lot or by any other method utilized by the Trustee
provided that if at the time of prepayment, the Securities are registered as a
Global Security, the Depositary shall determine in accordance with its
procedures the principal amount of Securities held for the account of its
participants to be prepaid.

                  In the event of prepayment of this Security in part only, a
new Security or Securities for the unprepaid portion hereof will be issued in
the name of the holder hereof upon the cancellation hereof.

                  If a Tax Event occurs, then the Company will have the right
(i) prior to the termination of Markel Capital Trust, to advance the Maturity
Date of this Security to the minimum extent required, but not to a date earlier
than twenty years from January 13, 1997 (the "Issue Date"), or (ii) to terminate

                                      111




Markel Capital Trust (if not previously terminated) and advance the Maturity
Date of this Security to the minimum extent required, but not to a date earlier
than forty years from the Issue Date, in each case such that, in the written
opinion of counsel experienced in such matters delivered to the Company, after
advancing the Maturity Date, interest paid on the Securities shall be deductible
for federal income tax purposes.

                  In case an Event of Default, as defined in the Indenture,
shall have occurred and be continuing, the principal of all of the Securities
may be declared, and upon such declaration shall become, due and payable, in the
manner, with the effect and subject to the conditions provided in the Indenture.

                  The Indenture contains provisions permitting the Company and
the Trustee, with the consent of the holders of a majority in aggregate
principal amount of the Securities at the time outstanding, as defined in the
Indenture, to execute supplemental indentures for the purpose of adding any
provisions to or changing in any manner or eliminating any of the provisions of
the Indenture or of modifying in any manner the rights of the holders of the
Securities; provided, however, that no such supplemental indenture shall,
without the consent of each holder of Securities then outstanding and affected
thereby, (i) extend the Maturity Date of any Securities, or reduce the principal
amount thereof, or reduce any amount payable on prepayment thereof, or reduce
the rate or extend the time of payment of interest thereon (subject to Article
XVI of the Indenture), or make the principal of, or interest or premium on, the
Securities payable in any coin or currency other than U.S. dollars, or impair or
affect the right of any holder of Securities to institute suit for the payment
thereof, or (ii) reduce the aforesaid percentage of Securities, the holders of
which are required to consent to any such supplemental indenture. The Indenture
also contains provisions permitting the holders of a majority in aggregate
principal amount of the Securities at the time outstanding affected thereby, on
behalf of all of the holders of the Securities, to waive any past default in the
performance of any of the covenants contained in the Indenture, or established
pursuant to the Indenture, and its consequences, except a default in the payment


                                      112



of the principal of or premium, if any, or interest on any of the Securities or
a default in respect of any covenant or provision under which the Indenture
cannot be modified or amended without the consent of each holder of Securities
then outstanding. Any such consent or waiver by the holder of this Security
(unless revoked as provided in the Indenture) shall be conclusive and binding
upon such holder and upon all future holders and owners of this Security and of
any Security issued in exchange heretofore or in place hereof (whether by
registration of transfer or otherwise), irrespective of whether or not any
notation of such consent or waiver is made upon this Security.

                  No reference herein to the Indenture and no provision of this
Security or of the Indenture shall alter or impair the obligation of the
Company, which is absolute and unconditional, to pay the principal of and
premium, if any, and interest on this Security at the time and place and at the
rate and in the money herein prescribed.

                  The Company shall have the right, at any time and from time to
time during the term of the Securities, to defer payments of interest by
extending the interest payment period of such Securities for a period not
exceeding 10 consecutive semi-annual periods, including the first such
semi-annual period during such extension period, and not to extend beyond the
Maturity Date of the Securities (an "Extended Interest Payment Period"), at the
end of which period the Company shall pay all interest then accrued and unpaid
together with interest thereon at the rate specified for the Securities (to the
extent that payment of such interest is enforceable under applicable law).
Before the termination of any such Extended Interest Payment Period, the Company
may further defer payments of interest by further extending such Extended
Interest Payment Period, provided that such Extended Interest Payment Period,
together with all such previous and further extensions within such Extended
Interest Payment Period, shall not exceed 10 consecutive semi-annual periods,
including the first semi-annual period during such Extended Interest Payment
Period, or extend beyond the Maturity Date of the Securities. Upon the
termination of any such Extended Interest Payment Period and the payment of all
accrued and unpaid interest and any additional amounts then due, the Company may
commence a new Extended Interest Payment Period, subject to the foregoing
requirements.

                                      113




                  The Company has agreed that it will not (i) declare or pay any
dividends or distributions on, or redeem, purchase, acquire, or make a
liquidation payment with respect to, any of the Company's capital stock (which
includes common and preferred stock) or (ii) make any payment of principal,
interest or-premium, if any, on or repay or repurchase or redeem any debt
securities of the Company that rank pari passu with or junior in right of
payment to the Securities or make any guarantee payments with respect to any
guarantee by the Company of the debt securities or any Subsidiary of the Company
if such guarantee ranks pari passu or junior in right of payment to the
Securities (other than (a) dividends or distributions in shares of, or options,
warrants or rights to subscribe for or purchase shares of, Common Stock of the
Company, (b) any declaration of a dividend in connection with the implementation
of a stockholder's rights plan, or the issuance of stock under any such plan in
the future, or the redemption or repurchase of any such rights pursuant thereto,
(c) payments under the Capital Securities Guarantee, (d) as a result of a
reclassification of the Company's capital stock or the exchange or the
conversion of one class or series of the Company's capital stock for another
class or series of the Company's capital stock, (e) the purchase of fractional
interests in shares of the Company's capital stock pursuant to the exchange or
conversion of such capital stock or the security being exchanged or converted,
and (f) purchases or issuances of Common Stock in connection with any of the
Company's stock option, stock purchase, stock loan or other benefit plans for
its directors, officers or employees or any of the Company's dividend
reinvestment plans, in each case as now existing or hereinafter established or
amended) if at such time (i) there shall have occurred any event of which the
Company has actual knowledge that (a) is, or with the giving of notice or the
lapse of time, or both, would be, an Event of Default and (b) in respect of
which the Company shall not have taken reasonable steps to cure, (ii) if such
Securities are held by Markel Capital Trust, the Company shall be in default
with respect to its payment of any obligations under the Capital Securities
Guarantee or (iii) the Company shall have given notice of its election of the
exercise of its right to extend the interest payment period and any such
extension shall be continuing.

                                      114




                  The Company will have the right at any time to liquidate
Markel Capital Trust and cause the Securities to be distributed to the holders
of the Trust Securities in liquidation of Markel Capital Trust.

                  The Securities are issuable only in registered form without
coupons in denominations of $1,000 and any integral multiple thereof. As
provided in the Indenture and subject to the transfer restrictions limitations
as may be contained herein and therein from time to time, the transfer of this
Security is registrable by the holder hereof on the Security Register of the
Company, upon surrender of this Security for registration of transfer at the
office or agency of the Trustee in the City and State of New York accompanied by
a written instrument or instruments of transfer in form satisfactory to the
Company or the Trustee duly executed by the holder hereof or his attorney duly
authorized in writing, and thereupon one or more new Securities of authorized
denominations and for the same aggregate principal amount and series will be
issued to the designated transferee or transferees. No service charge will be
made for any such registration of transfer, but the Company may require payment
of a sum sufficient to cover any tax or other governmental charge payable in
relation thereto.

                  Prior to due presentment for registration of transfer of this
Security, the Company, the Trustee, any paying agent and the registrar may deem
and treat the registered holder hereof as the absolute owner hereof (whether or
not this Security shall be overdue and notwithstanding any notice of ownership
or writing hereon made by anyone other than the Security Registrar) for the
purpose of receiving payment of or on account of the principal hereof and
premium, if any, and interest due hereon and for all other purposes, and neither
the Company nor the Trustee nor any paying agent nor any registrar shall be
affected by any notice to the contrary.


                                      115




                  No recourse shall be had for the payment of the principal of
or premium, if any, or interest on this Security, or for any claim based hereon,
or otherwise in respect hereof, or based on or in respect of the Indenture,
against any incorporator, stockholder, officer or director, past, present or
future, as such, of the Company or of any predecessor or successor Person,
whether by virtue of any constitution, statute or rule of law, or by the
enforcement of any assessment or penalty or otherwise, all such liability being,
by the acceptance hereof and as part of the consideration for the issuance
hereof, expressly waived and released.

                  All terms used in this Security that are defined in the
Indenture shall have the meanings assigned to them in the Indenture.

                  THE INDENTURE AND THE SECURITIES SHALL BE GOVERNED BY AND
CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK WITHOUT REGARD TO
CONFLICT OF LAW PROVISIONS THEREOF.




                                      116