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                Series B CAPITAL SECURITIES GUARANTEE AGREEMENT

                               Markel Corporation

                           Dated as of ________, 1997

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                               TABLE OF CONTENTS
                               -----------------


                                                                        Page
                                                                        ----

ARTICLE I
DEFINITIONS AND INTERPRETATION...........................................  2
         SECTION 1.1       Definitions and Interpretation................  2

ARTICLE II
TRUST INDENTURE ACT......................................................  6
         SECTION 2.1       Trust Indenture Act; Application..............  6
         SECTION 2.2       Lists of Holders of Securities................  6
         SECTION 2.3       Reports by the Capital Securities
                           Guarantee Trustee.............................  7
         SECTION 2.4       Periodic Reports to Capital Securities
                           Guarantee Trustee.............................  7
         SECTION 2.5       Evidence of Compliance with Conditions
                           Precedent.....................................  7
         SECTION 2.6       Events of Default; Waiver.....................  8
         SECTION 2.7       Event of Default; Notice......................  8
         SECTION 2.8       Conflicting Interests.........................  8

ARTICLE III
POWERS, DUTIES AND RIGHTS OF
CAPITAL SECURITIES GUARANTEE TRUSTEE.....................................  9
         SECTION 3.1       Powers and Duties of the Capital
                           Securities Guarantee Trustee..................  9
         SECTION 3.2       Certain Rights of Capital Securities
                           Guarantee Trustee............................. 11
         SECTION 3.3.      Not Responsible for Recitals or Issuance
                           of Series B Capital Securities Guarantee
                            ............................................. 13

ARTICLE IV
CAPITAL SECURITIES GUARANTEE TRUSTEE..................................... 14
         SECTION 4.1       Capital Securities Guarantee Trustee;
                           Eligibility................................... 14
         SECTION 4.2       Appointment, Removal and Resignation of
                           Capital Securities Guarantee Trustee.......... 15

ARTICLE V
GUARANTEE................................................................ 16
         SECTION 5.1       Guarantee..................................... 16
         SECTION 5.2       Waiver of Notice and Demand................... 16
         SECTION 5.3       Obligations Not Affected...................... 16
         SECTION 5.4       Rights of Holders............................. 17
         SECTION 5.5       Guarantee of Payment.......................... 18
         SECTION 5.6       Subrogation................................... 18



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         SECTION 5.7       Independent Obligations....................... 18
         SECTION 5.8       Possibility of Advancement
                                    of Maturity Date of Debentures....... 18
         SECTION 6.1       Limitation of Transactions.................... 19
         SECTION 6.2       Ranking....................................... 20

ARTICLE VII
TERMINATION.............................................................. 20
         SECTION 7.1       Termination................................... 20

ARTICLE VIII
INDEMNIFICATION.......................................................... 20
         SECTION 8.1       Exculpation................................... 20
         SECTION 8.2       Indemnification............................... 21

ARTICLE IX
MISCELLANEOUS............................................................ 21
         SECTION 9.1       Successors and Assigns........................ 21
         SECTION 9.2       Amendments.................................... 21
         SECTION 9.3       Notices....................................... 22
         SECTION 9.4       Exchange Offer................................ 23
         SECTION 9.5       Benefit....................................... 23
         SECTION 9.6       Governing Law................................. 23


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                Series B CAPITAL SECURITIES GUARANTEE AGREEMENT

                  This  GUARANTEE  AGREEMENT  (the "Series B Capital  Securities
Guarantee"),  dated as of _______,  1997,  is executed  and  delivered by Markel
Corporation,  a Virginia corporation (the "Guarantor"),  and The Chase Manhattan
Bank,  a New York  banking  corporation,  as trustee  (the  "Capital  Securities
Guarantee  Trustee"),  for the benefit of the Holders (as defined  herein)  from
time to time of the Series B Capital  Securities  (as defined  herein) of Markel
Capital Trust I, a Delaware statutory business trust (the "Issuer").

                  WHEREAS,  pursuant to an Amended and Restated  Declaration  of
Trust (the  "Declaration"),  dated as of January 13, 1997, among the trustees of
the Issuer,  the  Guarantor,  as sponsor,  and the holders  from time to time of
undivided  beneficial  interests  in the  assets of the  Issuer,  the  Issuer is
issuing  on the date  hereof  _____  capital  securities,  having  an  aggregate
liquidation  amount of $_______,  such capital  securities  being designated the
8.71% Series B Capital  Securities in connection  with the  consummation  of the
Exchange Offer (as defined in the Declaration).

                  WHEREAS, as incentive for the Holders to exchange the Series A
Capital  Securities  (as  defined in the  Declaration)  for the Series B Capital
Securities,  the Guarantor desires  irrevocably and unconditionally to agree, to
the extent set forth in this Series B Capital  Securities  Guarantee,  to pay to
the  Holders of the  Series B Capital  Securities  the  Guarantee  Payments  (as
defined below). The Guarantor agrees to make certain other payments on the terms
and conditions set forth herein.

                  WHEREAS,  the Guarantor has executed and delivered a guarantee
agreement (the "Common  Securities  Guarantee"),  with  substantially  identical
terms to this  Series B Capital  Securities  Guarantee,  for the  benefit of the
holders of the Common Securities (as defined herein), except that if an Event of
Default (as defined in the  Declaration)  has  occurred and is  continuing,  the
rights of holders of the Common Securities to receive  Guarantee  Payments under
the  Common  Securities  Guarantee  are  subordinated,  to the extent and in the
manner set forth in the Common Securities Guarantee, to the rights of holders of
Series A Capital  Securities  and the  Series B Capital  Securities  to  receive
Guarantee  Payments  under the  Series A Capital  Securities  Guarantee  and the
Series B Capital Securities Guarantee, as the case may be.

                  NOW, THEREFORE, in consideration of the exchange by any Holder
of Series A Capital Securities for Series B Capital  Securities,  which exchange
the Guarantor hereby acknowledges






shall benefit the Guarantor,  the Guarantor  executes and delivers this Series B
Capital Securities Guarantee for the benefit of the Holders.

                                   ARTICLE I
                         DEFINITIONS AND INTERPRETATION

         SECTION 1.1       Definitions and Interpretation

                  In this  Series B Capital  Securities  Guarantee,  unless  the
context otherwise requires:

                  (a)      capitalized  terms  used in  this  Series  B  Capital
                           Securities  Guarantee but not defined in the preamble
                           above have the respective  meanings  assigned to them
                           in this Section 1.1;

                  (b)      terms  defined in the  Declaration  as at the date of
                           execution   of  this  Series  B  Capital   Securities
                           Guarantee  have the same  meaning  when  used in this
                           Series  B   Capital   Securities   Guarantee   unless
                           otherwise defined in this Series B Capital Securities
                           Guarantee;

                  (c)      a term defined anywhere in this Series B Capital
                           Securities Guarantee has the same meaning throughout;

                  (d)      all  references  to "the Series B Capital  Securities
                           Guarantee"  or  "this  Series  B  Capital  Securities
                           Guarantee"  are to this  Series B Capital  Securities
                           Guarantee as modified,  supplemented  or amended from
                           time to time;

                  (e)      all  references  in this Series B Capital  Securities
                           Guarantee  to Articles  and  Sections are to Articles
                           and  Sections  of this  Series B  Capital  Securities
                           Guarantee, unless otherwise specified;

                  (f)      a term  defined  in the Trust  Indenture  Act has the
                           same  meaning  when  used in this  Series  B  Capital
                           Securities  Guarantee,  unless  otherwise  defined in
                           this Series B Capital Securities  Guarantee or unless
                           the context otherwise requires; and

                  (g)      a reference to the singular includes the plural and
                           vice versa.


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                  "Affiliate" has the same meaning as given to that term in Rule
405  under  the  Securities  Act of 1933,  as  amended,  or any  successor  rule
thereunder.

                  "Business  Day"  means  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   Securities   Guarantee  Trustee"  means  The  Chase
Manhattan  Bank,  a New York  banking  corporation,  until a  Successor  Capital
Securities   Guarantee   Trustee  has  been  appointed  and  has  accepted  such
appointment  pursuant to the terms of this Series B Capital Securities Guarantee
and thereafter means each such Successor Capital Securities Guarantee Trustee.

                  "Common  Securities" means the securities  representing common
undivided beneficial interests in the assets of the Issuer.

                  "Corporate  Trust  Office"  means the  office  of the  Capital
Securities  Guarantee  Trustee  at which the  corporate  trust  business  of the
Capital  Securities   Guarantee  Trustee  shall,  at  any  particular  time,  be
principally  administered,  which  office  at the  date  of  execution  of  this
Agreement is located at 450 West 33rd  Street,  15th Floor,  New York,  New York
10001, Attention: Corporate Trustee Administration.

                  "Covered  Person"  means  any  Holder or  beneficial  owner of
Series B Capital Securities.

                  "Debentures"  means the series of subordinated debt securities
of the Guarantor  designated the 8.71% Series B Junior  Subordinated  Deferrable
Interest Debentures due January 1, 2046 held by the Property Trustee (as defined
in the Declaration) of the Issuer.

                  "Event of Default"  means a default by the Guarantor on any of
its  payment  or  other  obligations  under  this  Series B  Capital  Securities
Guarantee.

                  "Guarantee   Payments"   means  the   following   payments  or
distributions,  without  duplication,  with  respect  to the  Series  B  Capital
Securities,  to the extent not paid or made by the Issuer:  (i) any  accumulated
and unpaid Distributions (as defined in the Declaration) that are required to be
paid on such Series B Capital  Securities  to the extent the Issuer has funds on
hand  legally  available  therefor  at such  time,  (ii) the  redemption  price,
including all  accumulated  and unpaid  Distributions  to the date of redemption
(the "Redemption Price") to the extent the


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Issuer has funds on hand legally  available  therefor at such time, with respect
to any Series B Capital  Securities  called for  redemption  by the Issuer,  and
(iii) upon a voluntary or involuntary  termination and liquidation of the Issuer
(other than in connection with the  distribution of Debentures to the Holders in
exchange for Series B Capital  Securities as provided in the  Declaration),  the
lesser of (a) the aggregate of the  liquidation  amount and all  accumulated and
unpaid  Distributions on the Series B Capital Securities to the date of payment,
to the extent the Issuer has funds on hand legally available  therefor,  and (b)
the amount of assets of the  Issuer  remaining  available  for  distribution  to
Holders in liquidation of the Issuer. If an Event of Default has occurred and is
continuing,  no Guarantee  Payments under the Common  Securities  Guarantee with
respect to the Common Securities or any guarantee payment under any Other Common
Securities  Guarantees  shall be made  until  the  Holders  of  Series B Capital
Securities  shall  be paid in full the  Guarantee  Payments  to  which  they are
entitled under this Series B Capital Securities Guarantee.

                  "Holder" shall mean any holder, as registered on the books and
records of the Issuer, of any Series B Capital  Securities;  provided,  however,
that, in determining whether the holders of the requisite percentage of Series B
Capital Securities have given any request,  notice, consent or waiver hereunder,
"Holder" shall not include the Guarantor or any Affiliate of the Guarantor.

                  "Indemnified  Person" means the Capital  Securities  Guarantee
Trustee,  any  Affiliate of the Capital  Securities  Guarantee  Trustee,  or any
officers,    directors,    shareholders,     members,    partners,    employees,
representatives,  nominees,  custodians  or  agents  of the  Capital  Securities
Guarantee Trustee.

                  "Indenture"  means the Indenture dated as of January 13, 1997,
among the Guarantor (the  "Debenture  Issuer") and The Chase  Manhattan Bank, as
trustee,  pursuant  to which the  Debentures  are to be  issued to the  Property
Trustee of the Issuer.

                  "Majority  in  liquidation  amount  of the  Series  B  Capital
Securities"  means,  except as  provided by the Trust  Indenture  Act, a vote by
Holder(s) of Series B Capital Securities,  voting separately as a class, of more
than 50% of the aggregate  liquidation  amount (including the stated amount that
would be paid on redemption,  liquidation  or otherwise,  plus  accumulated  and
unpaid  Distributions  to  the  date  upon  which  the  voting  percentages  are
determined) of all Series B Capital Securities.


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                  "Officers'  Certificate"  means, with respect to any person, a
certificate signed by two of the following:  the Chairman, a Vice Chairman,  the
Chief Executive Officer, the President,  a Vice President,  the Controller,  the
Secretary,  an Assistant Secretary,  the Treasurer or Assistant Treasurer of the
Guarantor. Any Officers' Certificate delivered with respect to compliance with a
condition or covenant provided for in this Series B Capital Securities Guarantee
shall include:

                  (a)      a statement that each officer signing the Officers'
         Certificate has read the covenant or condition and the definitions
         relating thereto;

                  (b)  a  statement   that  each  such  officer  has  made  such
         examination  or  investigation  as,  in  such  officer's  opinion,   is
         necessary to enable such  officer to express an informed  opinion as to
         whether or not such covenant or condition has been complied with; and

                  (c)      a statement as to whether, in the opinion of each
         such officer, such condition or covenant has been complied with.

                  "Other  Common  Securities  Guarantees"  shall  have  the same
meaning as "Other Guarantees" as defined in the Common Securities Guarantee.

                  "Other  Debentures" means all junior  subordinated  debentures
issued by the Guarantor  from time to time and sold to trusts to be  established
by the Guarantor (if any), in each case similar to the Issuer.

                  "Other  Guarantees"  means all guarantees  hereafter issued by
the Guarantor with respect to capital  securities (if any) similar to the Series
B Capital  Securities  issued by other trusts to be established by the Guarantor
(if any), in each case similar to the Issuer.

                  "Person"  means  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.

                  "Registration  Rights Agreement" means the Registration Rights
Agreement,  dated as of January 13, 1997, by and among the Guarantor, the Issuer
and the Initial Purchasers named therein as


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such agreement may be amended, modified or supplemented from time to time.

                  "Responsible  Officer"  means,  with  respect  to the  Capital
Securities  Guarantee Trustee,  any officer of the Capital Securities  Guarantee
Trustee,  with  responsibility  for the  administration of this Series B Capital
Securities Guarantee and also mean, with respect to a particular corporate trust
matter,  any other  officer  to whom such  matter is  referred  because  of that
officer's knowledge of and familiarity with the particular subject.

                  "Successor Capital Securities Guarantee Trustee" means a
successor Capital Securities Guarantee Trustee possessing the qualifications to
act as Capital Securities Guarantee Trustee under Section 4.1.

                  "Trust Indenture Act" means the Trust Indenture Act of 1939,
as amended.

                  "Trust Securities" means the Common Securities and the Series
A Capital Securities and Series B Capital Securities, collectively.

                                   ARTICLE II
                              TRUST INDENTURE ACT

SECTION 2.1       Trust Indenture Act; Application

                  (a) This Series B Capital  Securities  Guarantee is subject to
the  provisions of the Trust  Indenture Act that are required to be part of this
Series B Capital Securities  Guarantee and shall, to the extent  applicable,  be
governed by such provisions; and

                  (b) if and to the extent that any  provision  of this Series B
Capital  Securities  Guarantee  limits,  qualifies or conflicts  with the duties
imposed by Section  310 to 317,  inclusive,  of the Trust  Indenture  Act,  such
imposed duties shall control.

SECTION 2.2       Lists of Holders of Securities

                  (a)  The  Guarantor  shall  provide  the  Capital   Securities
Guarantee Trustee (unless the Capital Securities  Guarantee Trustee is otherwise
the  registrar  of the  Capital  Securities)  with a list,  in such  form as the
Capital Securities  Guarantee Trustee may reasonably  require,  of the names and
addresses of the Holders of the Series B Capital  Securities ("List of Holders")
as of such date, (i) within one Business Day after December 15 and


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June 15 of each year,  and (ii) at any other  time  within 30 days of receipt by
the  Guarantor  of a written  request for a List of Holders as of a date no more
than 14 days  before  such List of  Holders is given to the  Capital  Securities
Guarantee Trustee provided, that the Guarantor shall not be obligated to provide
such List of Holders at any time the List of  Holders  does not differ  from the
most recent List of Holders given to the Capital Securities Guarantee Trustee by
the Guarantor.  The Capital Securities Guarantee Trustee may destroy any List of
Holders previously given to it on receipt of a new List of Holders.

                  (b) The Capital Securities Guarantee Trustee shall comply with
its obligations  under Sections  311(a),  311(b) and Section 312(b) of the Trust
Indenture Act.

SECTION 2.3       Reports by the Capital Securities Guarantee Trustee

                  Within 60 days after May 15 of each year,  commencing  May 15,
1997, the Capital  Securities  Guarantee Trustee shall provide to the Holders of
the Series B Capital  Securities  such reports as are required by Section 313 of
the Trust  Indenture  Act,  if any,  in the form and in the manner  provided  by
Section 313 of the Trust Indenture Act. The Capital Securities Guarantee Trustee
shall also comply with the requirements of section 313(d) of the Trust Indenture
Act.

SECTION 2.4       Periodic Reports to Capital Securities Guarantee Trustee

                  The  Guarantor   shall  provide  to  the  Capital   Securities
Guarantee Trustee such documents, reports and information as required by Section
314 (if any) and the compliance certificate required by Section 314 of the Trust
Indenture  Act in the form,  in the manner and at the times  required by Section
314 of the Trust  Indenture  Act.  Delivery  of such  reports,  information  and
documents  to the  Capital  Securities  Guarantee  Trustee is for  informational
purposes only and the Capital  Securities  Guarantee  Trustee's  receipt of such
shall not constitute constructive notice of any information contained therein or
determinable  from  information  contained  therein,  including the  Guarantor's
compliance  with  any of  its  covenants  hereunder  (as to  which  the  Capital
Securities  Guarantee  Trustee is  entitled  to rely  exclusively  on  Officers'
Certificates).

SECTION 2.5       Evidence of Compliance with Conditions Precedent

                  The  Guarantor   shall  provide  to  the  Capital   Securities
Guarantee Trustee such evidence of compliance with any conditions precedent,  if
any, provided for in this Series B Capital


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Securities  Guarantee  that  relate to any of the  matters  set forth in Section
314(c) of the Trust  Indenture Act. Any  certificate  or opinion  required to be
given by an officer  pursuant to Section 14(c)(1) may be given in the form of an
Officers' Certificate.

SECTION 2.6       Events of Default; Waiver

                  The  Holders of a Majority in  liquidation  amount of Series B
Capital Securities may, by vote, on behalf of the Holders of all of the Series B
Capital Securities,  waive any past Event of Default and its consequences.  Upon
such waiver,  any such Event of Default  shall cease to exist,  and any Event of
Default arising  therefrom shall be deemed to have been cured, for every purpose
of this Series B Capital Securities  Guarantee,  but no such waiver shall extend
to any  subsequent  or other  default  or Event of  Default  or impair any right
consequent thereon.

SECTION 2.7       Event of Default; Notice

                  (a) The Capital Securities  Guarantee Trustee shall, within 90
days after the  occurrence of a default with respect to this Capital  Securities
Guarantee  known to a Responsible  Officer of the Capital  Securities  Guarantee
Trustee,  mail by first class  postage  prepaid,  to all Holders of the Series B
Capital  Securities,  notices of all defaults  actually  known to a  Responsible
Officer of the Capital Securities  Guarantee Trustee,  unless such defaults have
been cured before the giving of such notice,  provided, that, except in the case
of default in the  payment of any  Guarantee  Payment,  the  Capital  Securities
Guarantee  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  Capital  Securities  Guarantee
Trustee in good faith  determines  that the withholding of such notice is in the
interests of the holders of the Series B Capital Securities.

                  (b) The  Capital  Securities  Guarantee  Trustee  shall not be
deemed to have knowledge of any Event of Default  unless the Capital  Securities
Guarantee Trustee shall have received written notice,  or a Responsible  Officer
of the Capital  Securities  Guarantee Trustee charged with the administration of
the Declaration shall have obtained actual knowledge, of such Event of Default.

SECTION 2.8       Conflicting Interests

                  The Declaration  shall be deemed to be specifically  described
in this Series B Capital Securities  Guarantee for the purposes of clause (i) of
the first proviso contained in Section 310(b) of the Trust Indenture Act.


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                                  ARTICLE III
                          POWERS, DUTIES AND RIGHTS OF
                      CAPITAL SECURITIES GUARANTEE TRUSTEE

SECTION 3.1       Powers and Duties of the Capital Securities Guarantee Trustee

                  (a) This Series B Capital  Securities  Guarantee shall be held
by the Capital  Securities  Guarantee  Trustee for the benefit of the Holders of
the Series B Capital  Securities,  and the Capital Securities  Guarantee Trustee
shall not  transfer  this Series B Capital  Securities  Guarantee  to any Person
except a Holder of  Series B Capital  Securities  exercising  his or her  rights
pursuant  to  Section  5.4(b) or to a  Successor  Capital  Securities  Guarantee
Trustee on acceptance by such Successor Capital Securities  Guarantee Trustee of
its appointment to act as Successor Capital Securities  Guarantee  Trustee.  The
right,  title and interest of the Capital  Securities  Guarantee  Trustee  shall
automatically  vest in any Successor Capital Securities  Guarantee Trustee,  and
such  vesting  and  succession  of  title  shall  be  effective  whether  or not
conveyancing  documents  have  been  executed  and  delivered  pursuant  to  the
appointment of such Successor Capital Securities Guarantee Trustee.

                  (b) If an Event of  Default  actually  known to a  Responsible
Officer  of  the  Capital  Securities  Guarantee  Trustee  has  occurred  and is
continuing, the Capital Securities Guarantee Trustee shall enforce this Series B
Capital  Securities  Guarantee  for the  benefit of the  Holders of the Series B
Capital Securities.

                  (c) The  Capital  Securities  Guarantee  Trustee,  before  the
occurrence of any Event of Default and after the curing of all Events of Default
that may have  occurred,  shall  undertake  to perform  only such  duties as are
specifically  set forth in this Series B Capital  Securities  Guarantee,  and no
implied covenants shall be read into this Series B Capital Securities  Guarantee
against the Capital Securities  Guarantee  Trustee.  In case an Event of Default
has occurred (that has not been cured or waived  pursuant to Section 2.6) and is
actually  known to a  Responsible  Officer of the Capital  Securities  Guarantee
Trustee,  the Capital  Securities  Guarantee  Trustee shall exercise such of the
rights and powers  vested in it by this Series B Capital  Securities  Guarantee,
and use the same degree of care and skill in its exercise thereof,  as a prudent
person would  exercise or use under the  circumstances  in the conduct of his or
her own affairs.

                  (d)      No provision of this Series B Capital Securities
Guarantee shall be construed to relieve the Capital Securities


                                       9




Guarantee Trustee from liability for its own negligent action, its own negligent
failure to act, or its own willful misconduct, except that:

                  (i)      prior to the occurrence of any Event of Default and
         after the curing or waiving of all such Events of Default that may have
         occurred:

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

                           (B) in the  absence  of bad  faith on the part of the
                  Capital Securities  Guarantee Trustee,  the Capital Securities
                  Guarantee  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
                  Capital  Securities  Guarantee  Trustee and  conforming to the
                  requirements  of this Series B Capital  Securities  Guarantee;
                  but in the case of any such  certificates  or opinions that by
                  any provision hereof are specifically required to be furnished
                  to the  Capital  Securities  Guarantee  Trustee,  the  Capital
                  Securities  Guarantee Trustee shall be under a duty to examine
                  the  same to  determine  whether  or not they  conform  to the
                  requirements of this Series B Capital Securities Guarantee;

                  (ii) the Capital  Securities  Guarantee  Trustee  shall not be
         liable for any error of  judgment  made in good faith by a  Responsible
         Officer of the Capital Securities Guarantee Trustee, unless it shall be
         proved that the Capital  Securities  Guarantee Trustee was negligent in
         ascertaining the pertinent facts upon which such judgment was made;

                  (iii) the Capital  Securities  Guarantee  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  Holders  of a
         Majority  in  liquidation  amount of the  Series B  Capital  Securities
         relating to the time, method and place of conducting any proceeding for
         any remedy available to the Capital Securities Guarantee Trustee, or


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         exercising  any trust or power  conferred  upon the Capital  Securities
         Guarantee Trustee under this Series B Capital Securities Guarantee; and

                  (iv)  no  provision  of  this  Series  B  Capital   Securities
         Guarantee  shall require the Capital  Securities  Guarantee  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 the  Capital  Securities  Guarantee
         Trustee shall have reasonable  grounds for believing that the repayment
         of such funds or  liability is not  reasonably  assured to it under the
         terms of this  Series B  Capital  Securities  Guarantee  or  indemnity,
         reasonably  satisfactory to the Capital  Securities  Guarantee Trustee,
         against such risk or liability is not reasonably assured to it.

SECTION 3.2       Certain Rights of Capital Securities Guarantee Trustee

                  (a)      Subject to the provisions of Section 3.1:

                  (i) The Capital Securities  Guarantee Trustee may conclusively
         rely, and shall be fully protected in acting or refraining from acting,
         upon  any  resolution,   certificate,  statement  instrument,  opinion,
         report, notice,  request,  direction,  consent, order, bond, debenture,
         note,  other  evidence  of  indebtedness  or other  paper  or  document
         believed by it to be genuine and to have been signed, sent or presented
         by the proper party or parties.

                  (ii) Any  direction or act of the  Guarantor  contemplated  by
         this  Series  B  Capital  Securities   Guarantee  may  be  sufficiently
         evidenced by an Officers' Certificate.

                  (iii) Whenever, in the administration of this Series B Capital
         Securities  Guarantee,  the Capital Securities  Guarantee Trustee shall
         deem it desirable that a matter be proved or established before taking,
         suffering  or omitting  any action  hereunder,  the Capital  Securities
         Guarantee  Trustee  (unless  other  evidence  is  herein   specifically
         prescribed)  may, in the absence of bad faith on its part,  request and
         conclusively rely upon an Officers'  Certificate which, upon receipt of
         such request, shall be promptly delivered by the Guarantor.

                  (iv) The Capital  Securities  Guarantee  Trustee shall have no
         duty to see to any recording,  filing or registration of any instrument
         (or any rerecording, refiling or registration thereof).


                                       11




                  (v) The Capital Securities  Guarantee Trustee may consult with
         counsel of its  selection,  and the  advice or opinion of such  counsel
         with respect to legal matters shall be full and complete  authorization
         and  protection in respect of any action taken,  suffered or omitted by
         it  hereunder  in good  faith and in  accordance  with  such  advice or
         opinion.  Such  counsel may be counsel to the  Guarantor  or any of its
         Affiliates and may include any of its employees. The Capital Securities
         Guarantee Trustee shall have the right at any time to seek instructions
         concerning  the  administration  of this  Series B  Capital  Securities
         Guarantee from any court of competent jurisdiction.

                  (vi) The Capital  Securities  Guarantee Trustee shall be under
         no  obligation  to exercise any of the rights or powers vested in it by
         this Series B Capital Securities  Guarantee at the request or direction
         of any Holder,  unless such Holder  shall have  provided to the Capital
         Securities  Guarantee  Trustee such security and indemnity,  reasonably
         satisfactory to the Capital Securities  Guarantee Trustee,  against the
         costs,  expenses  (including  attorneys'  fees  and  expenses  and  the
         expenses of the Capital Securities Guarantee Trustee's agents, nominees
         or  custodians)  and  liabilities  that  might  be  incurred  by  it in
         complying  with such request or direction,  including  such  reasonable
         advances  as  may be  requested  by the  Capital  Securities  Guarantee
         Trustee;  provided that,  nothing contained in this Section  3.2(a)(vi)
         shall be taken to relieve the  Capital  Securities  Guarantee  Trustee,
         upon the  occurrence  of an  Event of  Default,  of its  obligation  to
         exercise  the rights and powers  vested in it by this  Series B Capital
         Securities Guarantee.

                  (vii) The Capital  Securities  Guarantee  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,  direction,  consent,  order, bond, debenture,  note,
         other  evidence of  indebtedness  or other paper or  document,  but the
         Capital Securities Guarantee Trustee, in its discretion,  may make such
         further inquiry or  investigation  into such facts or matters as it may
         see fit.

                  (viii) The Capital  Securities  Guarantee  Trustee may execute
         any of the trusts or powers  hereunder or perform any duties  hereunder
         either  directly  or by or  through  agents,  nominees,  custodians  or
         attorneys,  and the Capital  Securities  Guarantee Trustee shall not be
         responsible  for any  misconduct or negligence on the part of any agent
         or attorney appointed with due care by it hereunder.


                                       12




                  (ix) Any  action  taken by the  Capital  Securities  Guarantee
         Trustee or its agents  hereunder shall bind the Holders of the Series B
         Capital  Securities,  and  the  signature  of  the  Capital  Securities
         Guarantee Trustee or its agents alone shall be sufficient and effective
         to perform any such action. No third party shall be required to inquire
         as to the authority of the Capital  Securities  Guarantee Trustee to so
         act or as to its  compliance  with any of the terms and  provisions  of
         this  Series B Capital  Securities  Guarantee,  both of which  shall be
         conclusively evidenced by the Capital Securities Guarantee Trustee's or
         its agent's taking such action.

                  (x)  Whenever in the  administration  of this Series B Capital
         Securities  Guarantee the Capital  Securities  Guarantee  Trustee shall
         deem it desirable to receive instructions with respect to enforcing any
         remedy  or right or taking  any other  action  hereunder,  the  Capital
         Securities  Guarantee  Trustee  (i) may request  instructions  from the
         Holders of a  Majority  in  liquidation  amount of the Series B Capital
         Securities,  (ii) may refrain  from  enforcing  such remedy or right or
         taking such other  action until such  instructions  are  received,  and
         (iii)  shall be  protected  in  conclusively  relying  on or  acting in
         accordance with such instructions.

                  (xi) The Capital  Securities  Guarantee  Trustee  shall not be
         liable for any action taken,  suffered, or omitted to be taken by it in
         good faith,  without  negligence,  and reasonably  believed by it to be
         authorized or within the discretion or rights or powers  conferred upon
         it by this Series B Capital Securities Guarantee.

                  (b) No provision of this Series B Capital Securities Guarantee
shall be deemed to  impose  any duty or  obligation  on the  Capital  Securities
Guarantee Trustee to perform any act or acts or exercise any right,  power, duty
or obligation  conferred or imposed on it in any  jurisdiction in which it shall
be  illegal,  or in which the  Capital  Securities  Guarantee  Trustee  shall be
unqualified  or incompetent in accordance  with  applicable  law, to perform any
such act or acts or to exercise any such right,  power,  duty or obligation.  No
permissive  power or  authority  available to the Capital  Securities  Guarantee
Trustee shall be construed to be a duty.

SECTION 3.3.      Not Responsible for Recitals or Issuance of Series B Capital
                  Securities Guarantee

                  The  recitals  contained  in this Series B Capital  Securities
Guarantee shall be taken as the statements of the


                                       13




Guarantor,  and the Capital  Securities  Guarantee  Trustee  does not assume any
responsibility for their correctness.  The Capital Securities  Guarantee Trustee
makes no  representation  as to the  validity  or  sufficiency  of this Series B
Capital Securities Guarantee.


                                   ARTICLE IV
                      CAPITAL SECURITIES GUARANTEE TRUSTEE

SECTION 4.1       Capital Securities Guarantee Trustee; Eligibility

                  (a) There shall at all times be a Capital Securities Guarantee
Trustee which shall:

                  (i) not be an Affiliate of the Guarantor; and

                  (ii) 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 Person permitted by
         the  Securities  and  Exchange  Commission  to act as an  institutional
         trustee under the Trust  Indenture Act,  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 supervising or examining authority referred to above, then, for the
         purposes of this Section  4.1(a)(ii),  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.

                  (b) If at any time the Capital  Securities  Guarantee  Trustee
shall  cease  to be  eligible  to so  act  under  Section  4.1(a),  the  Capital
Securities Guarantee Trustee shall immediately resign in the manner and with the
effect set out in Section 4.2(c).

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


                                       14




SECTION 4.2       Appointment, Removal and Resignation of Capital Securities
                  Guarantee Trustee

                  (a)  Subject  to  Section  4.2(b),   the  Capital   Securities
Guarantee  Trustee may be appointed or removed  without cause at any time by the
Guarantor except during an Event of Default.

                  (b) The  Capital  Securities  Guarantee  Trustee  shall not be
removed in accordance with Section 4.2(a) until a Successor  Capital  Securities
Guarantee  Trustee has been  appointed  and has  accepted  such  appointment  by
written  instrument  executed by such  Successor  Capital  Securities  Guarantee
Trustee and delivered to the Guarantor.

                  (c) The Capital Securities Guarantee Trustee shall hold office
until a Successor Capital Securities Guarantee Trustee shall have been appointed
or until its removal or resignation.  The Capital  Securities  Guarantee Trustee
may resign from office  (without need for prior or subsequent  accounting) by an
instrument in writing executed by the Capital  Securities  Guarantee Trustee and
delivered  to the  Guarantor,  which  resignation  shall not take effect until a
Successor  Capital  Securities  Guarantee  Trustee  has been  appointed  and has
accepted such  appointment  by instrument in writing  executed by such Successor
Capital  Securities  Guarantee  Trustee and  delivered to the  Guarantor and the
resigning Capital Securities Guarantee Trustee.

                  (d) If no Successor Capital Securities Guarantee Trustee shall
have been  appointed  and accepted  appointment  as provided in this Section 4.2
within 60 days after  delivery of an instrument of removal or  resignation,  the
Capital Securities Guarantee Trustee resigning or being removed may petition any
court  of  competent   jurisdiction  for  appointment  of  a  Successor  Capital
Securities Guarantee Trustee.  Such court may thereupon,  after prescribing such
notice, if any, as it may deem proper,  appoint a Successor  Capital  Securities
Guarantee Trustee.

                  (e) No Capital  Securities  Guarantee  Trustee shall be liable
for the acts or omissions to act of any Successor Capital  securities  Guarantee
Trustee.

                  (f)  Upon  termination  of this  Series B  Capital  Securities
Guarantee or removal or resignation of the Capital Securities  Guarantee Trustee
pursuant to this Section 4.2, the Guarantor shall pay to the Capital  Securities
Guarantee  Trustee all amounts due to the Capital  Securities  Guarantee Trustee
accrued to the date of such termination, removal or resignation.


                                       15





                                   ARTICLE V
                                   GUARANTEE

SECTION 5.1       Guarantee

                  The Guarantor irrevocably and unconditionally agrees to pay in
full on a  subordinated  basis to the extent set forth in this  Series B Capital
Securities  Guarantee to the Holders the Guarantee Payments (without duplication
of amounts  theretofore paid by the Issuer),  as and when due, regardless of any
defense,  right of set-off or  counterclaim  that the Issuer may have or assert.
The  Guarantor's  obligation  to make a Guarantee  Payment may be  satisfied  by
direct  payment of the  required  amounts by the  Guarantor to the Holders or by
causing the Issuer to pay such amounts to the Holders.

SECTION 5.2       Waiver of Notice and Demand

                  The  Guarantor  hereby  waives  notice of  acceptance  of this
Series B Capital  Securities  Guarantee and of any liability to which it applies
or may apply, presentment, demand for payment, any right to require a proceeding
first  against  the Issuer or any other  Person  before  proceeding  against the
Guarantor,  protest,  notice  of  nonpayment,  notice  of  dishonor,  notice  of
redemption and all other notices and demands.

SECTION 5.3       Obligations Not Affected

                  The  obligations,  covenants,  agreements  and  duties  of the
Guarantor  under this Series B Capital  Securities  Guarantee shall in no way be
affected or impaired by reason of the happening  from time to time of any of the
following:

                  (a) the release or waiver,  by operation of law or  otherwise,
of the  performance  or  observance  by the  Issuer of any  express  or  implied
agreement,  covenant,  term  or  condition  relating  to the  Series  B  Capital
Securities to be performed or observed by the Issuer;

                  (b) the extension of time for the payment by the Issuer of all
or any portion of the Distributions,  Redemption Price, Liquidation Distribution
or any other sums payable under the terms of the Series B Capital  Securities or
the extension of time for the performance of any other obligation under, arising
out of, or in connection  with, the Series B Capital  Securities  (other than an
extension of time for payment of Distributions,  Redemption  Price,  Liquidation
Distribution  or other  sum  payable  that  results  from the  extension  of any
interest payment period on the Debentures permitted by the Indenture);


                                       16




                  (c) any failure,  omission,  delay or lack of diligence on the
part of the Holders to enforce, assert or exercise any right,  privilege,  power
or remedy conferred on the Holders pursuant to the terms of the Series B Capital
Securities,  or any  action on the part of the  Issuer  granting  indulgence  or
extension of any kind;

                  (d) the  voluntary or  involuntary  liquidation,  dissolution,
sale of any collateral, receivership, insolvency, bankruptcy, assignment for the
benefit of creditors,  reorganization,  arrangement, composition or readjustment
of debt of, or other  similar  proceedings  affecting,  the Issuer or any of the
assets of the Issuer;

                  (e) any invalidity of, or defect or deficiency in, the Series
B Capital Securities;

                  (f) the settlement or compromise of any obligation guaranteed
hereby or hereby incurred;

                  (g) the consummation of the Exchange Offer; or

                  (h) any other  circumstance  whatsoever  that might  otherwise
constitute  a legal or equitable  discharge or defense of a guarantor,  it being
the  intent of this  Section  5.3 that the  obligations  of the  Guarantor  with
respect to the Guarantee Payments shall be absolute and unconditional  under any
and all circumstances.

                  There shall be no obligation of the Holders to give notice to,
or obtain  consent of, the Guarantor with respect to the happening of any of the
foregoing.

SECTION 5.4       Rights of Holders

                  (a) The  Holders of a Majority  in  liquidation  amount of the
Series B Capital  Securities have the right to direct the time, method and place
of conducting any proceeding for any remedy available to the Capital  Securities
Guarantee  Trustee in respect of this Series B Capital  Securities  Guarantee or
exercising any trust or power  conferred upon the Capital  Securities  Guarantee
Trustee under this Series B Capital Securities Guarantee.

                  (b) If the  Capital  Securities  Guarantee  Trustee  fails  to
enforce  such  Series B Capital  Securities  Guarantee,  any  Holder of Series B
Capital  Securities  may  institute  a legal  proceeding  directly  against  the
Guarantor to enforce the Capital  Securities  Guarantee  Trustee's  rights under
this Series B Capital  Securities  Guarantee,  without first instituting a legal
proceeding against


                                       17




the Issuer,  the Capital  Securities  Guarantee  Trustee or any other  person or
entity.  The Guarantor  waives any right or remedy to require that any action be
brought first against the Issuer or any other person or entity before proceeding
directly against the Guarantor.

SECTION 5.5       Guarantee of Payment

                  This Series B Capital Securities Guarantee creates a guarantee
of payment and not of collection.

SECTION 5.6       Subrogation

                  The  Guarantor  shall be  subrogated to all (if any) rights of
the Holders of Series B Capital  Securities against the Issuer in respect of any
amounts  paid to such  Holders  by the  Guarantor  under  this  Series B Capital
Securities Guarantee; provided, however, that the Guarantor shall not (except to
the extent  required by mandatory  provisions  of law) be entitled to enforce or
exercise any right that it may acquire by way of  subrogation  or any indemnity,
reimbursement or other agreement, in all cases as a result of payment under this
Series B Capital Securities Guarantee,  if, at the time of any such payment, any
amounts are due and unpaid under this Series B Capital Securities Guarantee.  If
any  amount  shall  be paid  to the  Guarantor  in  violation  of the  preceding
sentence,  the Guarantor agrees to hold such amount in trust for the Holders and
to pay over such amount to the Holders.

SECTION 5.7       Independent Obligations

                  The Guarantor  acknowledges that its obligations hereunder are
independent  of the  obligations  of the  Issuer  with  respect  to the Series B
Capital  Securities,  and that the Guarantor shall be liable as principal and as
debtor hereunder to make Guarantee Payments pursuant to the terms of this Series
B Capital  Securities  Guarantee  notwithstanding  the  occurrence  of any event
referred to in subsections (a) through (h), inclusive, of Section 5.3 hereof.

SECTION 5.8       Possibility of Advancement of Maturity Date of Debentures

                  The parties  hereto  acknowledge  that the  Maturity  Date (as
defined in the  Indenture)  of the  Debentures  may be advanced  pursuant to the
provisions of Section 14.06 of the Indenture.


                                       18




                                   ARTICLE VI
                   LIMITATION OF TRANSACTIONS; SUBORDINATION

SECTION 6.1       Limitation of Transactions

                  So long as any  Capital  Securities  remain  outstanding,  the
Guarantor  shall 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 Guarantor'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 Guarantor  (including any Other
Debentures)  that rank pari  passu  with or  junior in right of  payment  to the
Debentures or (iii) make any guarantee payments with respect to any guarantee by
the  Guarantor  of the  debt  securities  of  any  subsidiary  of the  Guarantor
(including  Other  Guarantees) if such  guarantee  ranks pari passu or junior in
right of payment to the Debentures (other than (a) dividends or distributions in
shares of, or options,  warrants, rights to subscribe for or purchase shares of,
common stock of the Guarantor,  (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 Guarantor's  capital stock or the
exchange or the  conversion  of one class or series of the  Guarantor's  capital
stock for another  class or series of the  Guarantor's  capital  stock,  (e) the
purchase of  fractional  interests in shares of the  Guarantor'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 Guarantor's  stock option,  stock purchase,
stock loan or other  benefit plans for its  directors,  officers or employees or
any of the Guarantor's dividend 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 Guarantor 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  Guarantor  shall  not  have  taken
reasonable  steps  to cure,  (ii) if such  Debentures  are held by the  Property
Trustee,  the  Guarantor  shall be in default with respect to its payment of any
obligations  under  this  Series B  Capital  Securities  Guarantee  or (iii) the
Guarantor  shall have given  notice of its election of the exercise of its right
to extend the interest payment period pursuant to Section 16.01 of the Indenture
and any such extension shall be continuing.


                                       19





SECTION 6.2       Ranking

                  This Series B Capital Securities  Guarantee will constitute an
unsecured  obligation of the Guarantor and will rank (i)  subordinate and junior
in right of payment to Senior Indebtedness (as defined in the Indenture), to the
same extent and in the same  manner  that the  Debentures  are  subordinated  to
Senior  Indebtedness  pursuant to the Indenture  (except as indicated below), it
being  understood  that the terms of Article XV of the Indenture  shall apply to
the  obligations  of the  Guarantor  under  this  Series  B  Capital  Securities
Guarantee  as if (x) such  Article XV were set forth herein in full and (y) such
obligations were substituted for the term "Securities" appearing in such Article
XV, except that with respect to Section 15.03 of the  Indenture  only,  the term
"Senior  Indebtedness"  shall mean all liabilities of the Guarantor,  whether or
not for money borrowed (other than obligations in respect of Other  Guarantees),
(ii) pari passu  with any Other  Guarantee  (as  defined  herein)  and any Other
Common  Securities  Guarantee and (iii) senior to any  obligations in respect of
any class of the Guarantor's capital stock.

                                  ARTICLE VII
                                  TERMINATION

SECTION 7.1       Termination

                  This Series B Capital Securities Guarantee shall terminate and
be of no further force and effect (i) upon full payment of the Redemption  Price
(as defined in the Declaration) of all Series B Capital Securities, or (ii) upon
liquidation of the Issuer, the full payment of the amounts payable in accordance
with the Declaration or the distribution of the Debentures to the Holders of all
of the Series B Capital Securities. Notwithstanding the foregoing, this Series B
Capital  Securities   Guarantee  will  continue  to  be  effective  or  will  be
reinstated,  as the case may be,  if at any time any  Holder of Series B Capital
Securities  must  restore  payment  of any sums paid  under the Series B Capital
Securities or under this Series B Capital Securities Guarantee.

                                  ARTICLE VIII
                                INDEMNIFICATION

SECTION 8.1       Exculpation

                  (a) No  Indemnified  Person  shall be liable,  responsible  or
accountable  in damages or otherwise to the Guarantor or any Covered  Person for
any loss, damage or claim incurred by reason of any act or omission performed or
omitted by such Indemnified


                                       20




Person  in good  faith in  accordance  with  this  Series B  Capital  Securities
Guarantee and in a manner that such Indemnified Person reasonably believed to be
within the scope of the authority  conferred on such Indemnified  Person by this
Series B Capital  Securities  Guarantee  or by law,  except that an  Indemnified
Person shall be liable for any such loss,  damage or claim incurred by reason of
such Indemnified  Person's negligence or willful misconduct with respect to such
acts or omissions.

                  (b) An Indemnified  Person shall be fully protected in relying
in good  faith  upon the  records of the  Guarantor  and upon such  information,
opinions,  reports or statements  presented to the Guarantor by any Person as to
matters  the  Indemnified  Person  reasonably  believes  are  within  such other
Person's  professional  or  expert  competence  and who has been  selected  with
reasonable  care  by or on  behalf  of  the  Guarantor,  including  information,
opinions,  reports  or  statements  as to the  value and  amount of the  assets,
liabilities,  profits, losses, or any other facts pertinent to the existence and
amount  of  assets  from  which  Distributions  to  Holders  of Series B Capital
Securities might properly be paid.

SECTION 8.2       Indemnification

                  The Guarantor agrees to indemnify each Indemnified Person for,
and to hold  each  Indemnified  Person  harmless  against,  any  and  all  loss,
liability,  damage, claim or expense incurred without negligence or bad faith on
its part,  arising out of or in connection with the acceptance or administration
of the trust or trusts  hereunder,  including the costs and expenses  (including
reasonable   legal  fees  and  expenses)  of  defending   itself   against,   or
investigating,  any  claim or  liability  in  connection  with the  exercise  or
performance  of any  of its  powers  or  duties  hereunder.  The  obligation  to
indemnify as set forth in this Section 8.2 shall survive the termination of this
Series B Capital Securities Guarantee.


                                   ARTICLE IX
                                 MISCELLANEOUS

SECTION 9.1       Successors and Assigns

                  All  guarantees  and  agreements  contained  in this  Series B
Capital  Securities  Guarantee  shall bind the successors,  assigns,  receivers,
trustees and  representatives of the Guarantor and shall inure to the benefit of
the Holders of the Series B Capital Securities then outstanding.



                                       21





SECTION 9.2       Amendments

                  Except  with  respect to any  changes  that do not  materially
adversely affect the rights of Holders (in which case no consent of Holders will
be  required),  this Series B Capital  Securities  Guarantee may only be amended
with the prior  approval of the Holders of a Majority in  liquidation  amount of
the  Securities  (including  the stated amount that would be paid on redemption,
liquidation or otherwise, plus accrued and unpaid Distributions to the date upon
which the voting percentages are determined).  The provisions of Section 12.2 of
the Declaration  with respect to meetings of Holders of the Securities  apply to
the giving of such approval.

SECTION 9.3       Notices

                  All notices  provided for in this Series B Capital  Securities
Guarantee shall be in writing,  duly signed by the party giving such notice, and
shall be delivered, telecopied or mailed by first class mail, as follows:

                  (a) If  given  to the  Issuer,  in care of the  Administrative
Trustee at the Issuer's  mailing  address set forth below (or such other address
as the Issuer may give notice of to the Holders of the Common Securities):

                             Markel Capital Trust I
                             c/o Markel Corporation
                             4551 Cox Road
                             Glen Allen, Virginia  23060-3382
                             Attention: Corporate Counsel
                             Telecopy:  (804) 527-3810

                  (b) If given to the Capital Securities  Guarantee Trustee,  at
the Capital Securities  Guarantee  Trustee's mailing address set forth below (or
such other address as the Capital  Securities  Guarantee Trustee may give notice
of to the Holders of the Series B Capital Securities):

                             The Chase Manhattan Bank
                             450 W. 33rd Street
                             New York, New York 10001
                             Attention: Corporate Trust
                                        Administration Department
                             Telecopy: (212) 946-8160

                  (c) If  given to the  Guarantor,  at the  Guarantor's  mailing
address set forth below (or such other  address as the Guarantor may give notice
of to the Holders of the Series B Capital Securities):


                                       22





                             Markel Corporation
                             4551 Cox Road
                             Glen Allen, Virginia  23060-3382
                             Attention: Corporate Counsel
                             Telecopy: (804) 527-3810

                  (d) If given to any Holder of Series B Capital Securities, at
the address set forth on the books and records of the Issuer.

                  All such  notices  shall be  deemed to have  been  given  when
received in person,  telecopied with receipt confirmed, or 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.


SECTION 9.4       Benefit

                  This Series B Capital  Securities  Guarantee is solely for the
benefit  of the  Holders  of the  Series B Capital  Securities  and,  subject to
Section  3.1(a),  is not  separately  transferable  from the  Series  B  Capital
Securities.

SECTION 9.5       Governing Law

                  THIS SERIES B CAPITAL  SECURITIES  GUARANTEE SHALL BE GOVERNED
BY, AND CONSTRUED AND  INTERPRETED IN ACCORDANCE  WITH, THE LAWS OF THE STATE OF
NEW YORK, WITHOUT REGARD TO CONFLICTS OF LAWS PRINCIPLES THEREOF.



                                       23




                  THIS SERIES B CAPITAL  SECURITIES  GUARANTEE is executed as of
the day and year first above written.


                                    MARKEL CORPORATION, as
                                    Guarantor


                                    By:
                                        -----------------------------------
                                        Name:
                                        Title:

                                        THE CHASE MANHATTAN BANK, as
                                          Capital Securities Guarantee
                                          Trustee


                                    By:
                                        -----------------------------------
                                        Name:
                                        Title: