Exhibit 99.4
                                                                  CONFORMED COPY

                          REGISTRATION RIGHTS AGREEMENT

                                      AMONG

                               MARKEL CORPORATION

                                       AND

                        DLJ INTERNATIONAL PARTNERS, C.V.
                           DLJ OFFSHORE PARTNERS, C.V.
                          DLJMB OVERSEAS PARTNERS, C.V.
                       DLJ MERCHANT BANKING FUNDING, INC.
                               DLJ FIRST ESC, L.P.
               DONALDSON, LUFKIN & JENRETTE SECURITIES CORPORATION

                                       AND

                         MARSH & MCLENNAN CAPITAL, INC.

                                       AND

                                  JOHN J. BYRNE

                           Dated as of August 15, 1999


                                TABLE OF CONTENTS

                                                                      PAGE
                                                                      ----
SECTION 1. Definitions...................................................2
SECTION 2. Registration under Securities Act.............................4
SECTION 3. Other Registration Rights....................................16
SECTION 4. Markel Guarantee.............................................16
SECTION 5. Amendments and Waivers.......................................16
SECTION 6. Notices......................................................17
SECTION 7. Binding Agreement............................................17
SECTION 8. Descriptive Headings.........................................18
SECTION 9. Specific Performance.........................................18
SECTION 10. Effectiveness...............................................18
SECTION 11. Termination.................................................18
SECTION 12. Governing Law...............................................18
SECTION 13. Counterparts................................................18
SECTION 14. Entire Agreement............................................19





                         REGISTRATION RIGHTS AGREEMENT

     This REGISTRATION RIGHTS AGREEMENT is made as of August 15, 1999, by and
among MARKEL CORPORATION, a Virginia corporation ("Markel"), DLJ INTERNATIONAL
PARTNERS, C.V., a Netherlands Antilles limited partnership, DLJ OFFSHORE
PARTNERS, C.V., a Netherlands Antilles limited partnership, DLJMB OVERSEAS
PARTNERS, C.V., a Netherlands Antilles limited partnership, DLJ MERCHANT BANKING
FUNDING, INC., a Delaware corporation, DLJ FIRST ESC, L.P., a Delaware limited
partnership and DONALDSON, LUFKIN & JENRETTE SECURITIES CORPORATION, a Delaware
corporation (collectively, the "DLJ Entities"), MARSH & MCLENNAN CAPITAL. INC.,
a Delaware corporation, on behalf of itself and/or MARSH & MCLENNAN RISK CAPITAL
HOLDINGS, LTD., a Delaware corporation, other related Marsh & McLennan Capital,
Inc. entities and/or RISK CAPITAL REINSURANCE COMPANY, a Nebraska domiciled
insurance company (collectively, "Marsh") and JOHN J. BYRNE, on his own behalf
and on behalf of certain entities as to which, with respect to Common Shares
held by such entities, he has voting and dispositive power ("Byrne").


     A.    Simultaneously herewith, Markel and Terra Nova (Bermuda) Holdings
Ltd., a Bermuda corporation ("TNA"), entered into an Agreement and Plan of
Merger and Scheme of Arrangement (the "Merger Agreement").

     B.    The Merger Agreement provides for (i) the merger (the "Merger") of
Mint Sub Ltd., a corporation to be organized under the laws of Virginia and a
wholly-owned subsidiary of Virginia Holdings Inc., a corporation to be organized
under the laws of Virginia (the "Company"), with and into Markel and (ii) a
Scheme of Arrangement between TNA and certain of its shareholders (the
"Scheme"). Pursuant to the Merger Agreement, the holders of the outstanding
stock of TNA will be entitled to receive the applicable consideration set forth
in the Merger Agreement. Holders of the outstanding stock of TNA who elect to
receive Common Stock Consideration (as defined in the Merger Agreement) in the
Merger will receive ordinary shares of the Company, no par value (the "Common
Shares"), and will become shareholders of the Company. Upon consummation of the
Merger and the Scheme, TNA and Markel will be wholly-owned subsidiaries of the
Company, which, at such time, will change its name to Markel Corporation.

     C.    TNA and the DLJ Entities are parties to that certain Registration
Rights Agreement dated as of March 25, 1996, among TNA and certain of its
stockholders, pursuant to which such stockholders were accorded certain



registration rights with respect to the ordinary shares of TNA held by them (the
"TNA Registration Rights Agreement").

     In consideration of the parties entering into the agreements and carrying
out the transactions herein described, and for other good and valuable
consideration, the parties agree as follows:

     SECTION 1. Definitions. As used herein, unless the context otherwise
requires, the following terms have the following respective meanings:

     "Affiliate" means, with respect to any Person, any other Person directly or
indirectly controlling, controlled by, or under common control with such Person;
provided that no stockholder of the Company shall be deemed an Affiliate of any
other stockholder of the Company solely by reason of any investment in the
Company. For the purpose of this definition, the term "control" (including with
correlative meanings, the terms "controlling", "controlled by" and "under common
control with"), when used with respect to any Person, means the possession,
directly or indirectly, of the power to direct or cause the direction of the
management and policies of such Person, whether through the ownership of voting
securities, by contract or otherwise.

     "Board" means the Board of Directors of the Company.

     "Commission"  means the  Securities  and Exchange  Commission  or any other
United States agency at the time administering the Securities Act.

     "Exchange Act" means the Securities Exchange Act of 1934, or any similar
United States statute, and the rules and regulations of the Commission
thereunder, all as the same shall be in effect at the time.

     "Person" means an individual, a partnership, a joint venture, a
corporation, a limited liability company, a trust, an unincorporated
organization and a government or any department or agency thereof.

     "Permitted Transferee" means, in the case of any DLJ Entity, (A) any other
DLJ Entity, (B) any general or limited partner of any DLJ Entity (a "DLJ
Partner"), and any corporation, partnership, Affiliated Employee Benefit Trust
or other entity that is an Affiliate of any DLJ Partner (collectively, the "DLJ
Affiliates"), (C) any managing director, general partner, director, limited
partner, officer or employee of Donaldson, Lufkin & Jenrette, Inc. or any entity
controlled by Donaldson, Lufkin & Jenrette, Inc., or the heirs, executors,
administrators, testamentary trustees, legatees or beneficiaries of any of the
foregoing persons referred to in this clause (C) (collectively, "DLJ
Associates"), (D) a trust, the

                                   2


beneficiaries of which, or a corporation, limited liability company or
partnership, the stockholders, members or general or limited partners of which,
include only DLJ Entities, DLJ Affiliates, DLJ Associates, their spouses or
their lineal descendants or (E) a voting trustee for one or more DLJ Entities,
DLJ Affiliates or DLJ Associates under the terms of a voting trust designated to
conform with the requirements of the Insurance Law of the State of New York.

     "Registrable Securities" means (i) any outstanding Common Shares held by
any Stockholder as of the effective date of this Agreement and (ii) any
securities issued with respect to any such Common Shares by way of stock
dividend or stock split. As to any particular Registrable Securities, such
securities shall cease to be Registrable Securities (i) when a registration
statement with respect to the sale of such securities shall have become
effective under the Securities Act and such securities shall have been
distributed in accordance with such registration statement, (ii) when such
securities have been distributed to the public pursuant to Rule 144 (or any
successor provision) under the Securities Act, (iii) when such securities shall
have been otherwise transferred, except as contemplated by Section 7 of this
Agreement, or (iv) when such securities shall have ceased to be outstanding.

     "Registration Expenses" means (i) all registration, filing and NASD fees,
(ii) fees and expenses of complying with securities or blue sky laws (including
reasonable fees and disbursements of counsel in connection with blue sky
qualifications of the shares covered by such registration), (iii) printing
expenses, (iv) internal expenses of the Company (including all salaries and
expenses of its officers and employees performing legal and accounting duties),
(v) reasonable fees and disbursements of counsel for the Company and of its
independent certified public accountants, including the expenses relating to
"cold comfort" letters requested pursuant thereto, (vi) not more than $25,000 of
reasonable fees and disbursements of one counsel for the Stockholders in
connection with their participation in any offering, (vii) the reasonable fees
and expenses of special experts retained by the Company in connection with such
registration, premiums and other costs of policies of insurance against
liabilities arising out of the public offering of the Registrable Securities
being registered (if the Company elects to obtain any such insurance), and
(viii) any fees and disbursements of underwriters customarily paid by issuers
or sellers of securities, but excluding underwriting discounts and commissions
and transfer taxes, if any, and the fees and expenses of counsel for the
underwriters.

     "Requesting Holder" means, in respect of any registration pursuant to
Section 2 hereof, any holder of Registrable Securities who gives notice to the
Company of its request to include Registrable Securities in such registration.


                                        3


     "Rule 144" means Rule 144 promulgated by the Commission under the
Securities Act as such rule may be amended from time to time, or any similar
rule then in force.

     "Securities Act" means the Securities Act of 1933, or any similar United
States statute, and the rules and regulations of the Commission thereunder, all
as the same shall be in effect at the time.

     "Stockholders" means any of the DLJ Entities, Byrne or Marsh, acting on
behalf of itself, other related Marsh & McLennan Capital, Inc. entities and/or
Marsh & McLennan Risk Capital Holdings, Ltd. and/or Risk Capital Reinsurance
Company.

     SECTION 2. Registration under Securities Act.

     (a) Registration on Request.

            (i)  Request. If at any time any DLJ Entity or Marsh requests in
     writing (the requesting Person being referred to as the "Initiating
     Stockholder") that the Company effect the registration under the Securities
     Act of a specified number of the Registrable Securities held by it and
     specifying the intended method of disposition thereof, a copy of which
     request (the "Company Notice") shall be sent by the Company to the other
     Persons entitled to request registration under this Section 2(a) that have
     not made such registration request (the "Other Stockholders"), the Company
     will, in accordance with the provisions of Section 2(c) hereof, use its
     commercially reasonable efforts to effect the registration under the
     Securities Act of the Registrable Securities which the Company has been so
     requested to register by the Initiating Stockholder and by any Other
     Stockholders, so long as such Other Stockholders have requested that such
     Registrable Securities be included in such registration within 10 days of
     the date of the Company Notice, for disposition in accordance with the
     intended method or methods of disposition stated in the request by the
     Initiating Stockholder, all to the extent requisite to permit the
     disposition (in accordance with the intended methods thereof as aforesaid)
     of Registrable Securities to be so registered; provided that the Company
     shall not be required to effect (A) more than three registrations requested
     by the DLJ Entities pursuant to this Section 2(a), (B) more than two
     registrations requested by Marsh pursuant to this Section 2(a), (C) any
     registration under this Section 2(a) unless the Registrable Securities
     requested to be included therein by the Initiating Stockholder, in the
     reasonable judgment of the Board exercised in good faith, have an aggregate
     fair market value of at least $25,000,000, unless the Registrable
     Securities requested to be

                                        4


included therein constitute all of the Registrable Securities then owned by the
Initiating Stockholder (and, in case of any DLJ Entity, all other DLJ Entities)
or (D) any registration under this Section 2(a) prior to the earlier of the date
that is six months after the effective date of the Company's most recent
registration statement (other than a registration on Form S-4 or Form S-8 or any
successor or similar forms) pursuant to which Registrable Securities are to be
or were sold pursuant to this Section 2(a) or the date that is three months
after the effective date of the Company's most recent registration statement
(other than a registration on Form S-4 or Form S-8 or any successor or similar
forms) pursuant to which the DLJ Entities or Marsh were entitled to request that
Registrable Securities be sold pursuant to Section 2(b). Any request by an
Initiating Stockholder pursuant to the first sentence of this Section 2(a) shall
indicate that such Initiating Stockholder intends, in good faith, to dispose of
all of the Registrable Securities as to which a request is made pursuant to this
Section 2(a) pursuant to an underwritten public offering; provided that such
intention shall not preclude a change to the plan of distribution to allow block
trades, it being understood that no such change may be made with the intention
of converting such registration into the functional equivalent of an "equity
shelf." A request to register Registrable Securities pursuant to this Section
2(a) that is made by any DLJ Entity or Marsh, as the case may be, in its
capacity as an "Other Stockholder" shall not reduce the number of registrations
available to such entity pursuant to paragraph (A) or (B), as the case may be,
of this Section 2(a)(i).

     (ii)  Effective Registration Statement. A registration requested pursuant
to this Section 2(a) shall not be deemed to be effected pursuant to Section 2(a)
(A) if a registration statement with respect thereto shall not have become
effective and remained effective for a period of at least 180 days (or such
shorter period in which the Registrable Securities included in such registration
pursuant to Section 2(a) have been sold thereunder), (B) if, after it has become
effective, such registration is interfered with for any reason by any stop
order, injunction or other order or requirement of the Commission or any other
governmental agency or any court, and the result of such interference is to
prevent the holders of Registrable Securities to be sold thereunder from
disposing of at least 75% of the Registrable Securities included in such
registration pursuant to Section 2(a) in accordance with the intended methods of
disposition or (C) if the conditions to closing specified in the purchase
agreement or underwriting agreement entered into in connection with any
underwritten registration shall not be satisfied or waived with the consent of
the holders of Registrable Securities that were to have been sold thereunder,
other than as


                                        5


a result of any  breach  by any  holder of its  obligations  thereunder  or
hereunder.

    (iii)  Expenses.  The  Company  shall  pay  all  Registration  Expenses  in
connection with any registration requested pursuant to this Section 2(a).

     (iv)  Priority in Requested Registrations. If a requested registration
pursuant to this Section 2(a) involves an underwritten offering, and the
managing underwriter shall advise the Company in writing that, in its view, (1)
the number of securities requested, pursuant to this Section 2(a), to be
included in such registration (including Common Shares which the Company
proposes to include, whether or not for the sale for its own account, which are
not Registrable Securities) or (ii) the inclusion of some or all of the Common
Shares owned by other shareholders of the Company (including Registrable
Securities proposed to be included by any Stockholder pursuant to Section 2(b)),
in either case, exceeds the number which can be sold in such offering without
having an adverse impact on such offering, including the price at which such
shares can be sold (the "Maximum Offering Size"), the Company will include in
such registration, in the priority listed below, up to the Maximum Offering Size
(A) first, Registrable Securities requested, pursuant to this Section 2(a), to
be included in such registration by the DLJ Entities and Marsh, as the case may
be, (pro rata as between them based on the number of Registrable Securities
proposed to be so registered) and (B) second, Registrable Securities requested
to be included in such registration by the Company for its own account, by Byrne
pursuant to Section 2(b) or by any other holder of Common Shares having
registration rights, in the case of this paragraph (B), pro rata among such
holders on the basis of the number of Registrable Securities requested to be so
registered; provided that if, as a result of any reduction in Registrable
Securities to be sold as contemplated by this Section 2(a)(iv), the Initiating
Stockholder is entitled to sell pursuant to such registration less than 65% of
the Registrable Securities requested to be included pursuant to Section 2(a),
the request by the Initiating Stockholder that initiated such registration shall
not reduce the number of registrations available to the Initiating Stockholder
pursuant to paragraph (A) or (B), as the case may be, of Section 2(a)(i).

(b) Incidental Registration.

     (i)  Right to Include Registrable Securities. If the Company at any time
proposes to register any Common Shares under the Securities Act, whether for its
own account or the account of a third party (other than by a registration (A) on
Form S-4 or S-8 or any successor or similar

                                        6


forms, (B) relating to Common Shares issuable upon exercise of employee stock
options or in connection with any employee benefit plan or (C) in connection
with any direct or indirect exchange offer, amalgamation, merger, acquisition or
similar transaction whether or not for sale for its own account), the Company
will at each such time give prompt written notice to the Stockholders of its
intention to do so and of such holders' rights under this Section 2(b). Upon the
written request of any such holder of Registrable Securities made within 10 days
after the receipt of any such notice (which request shall specify the
Registrable Securities intended to be disposed of by such holder and the
intended method of disposition thereof), the Company will, subject to the
provisions of paragraph (iii) of this Section 2(b), use its reasonable efforts
to effect the registration under the Securities Act of all Registrable
Securities which the Company has been so requested to register by the holders
thereof, to the extent requisite to permit the disposition (in accordance with
the intended methods thereof as aforesaid) of the Registrable Securities so to
be registered; provided that (i) if such registration involves an underwritten
offering, all such holders of Registrable Securities requesting to be included
in such registration must enter into the underwriting agreement as contemplated
by Section 2(d) hereof and (ii) if, at any time after giving written notice of
its intention to register any securities pursuant to this Section 2(b) and prior
to the effective date of the registration statement filed in connection with
such registration, the Company shall determine for any reason not to register or
to delay registration of such securities, the Company may, at its election, give
written notice of such determination to all such shareholders and, thereupon,
(A) in the case of a determination not to register, shall be relieved of its
obligation to register any Registrable Securities in connection with such
registration and (B) in the case of a determination to delay registering, shall
be permitted to delay registering any Registrable Securities, for the same
period as the delay in registering such other securities.

     (ii)  Expenses. The Company shall pay all Registration Expenses in
connection with any registration requested pursuant to this Section 2(b).

    (iii)  Priority in Incidental Registrations. If a registration pursuant to
this Section 2(b) involves an underwritten offering (other than in the case of a
registration under Section 2(a)), and the managing underwriter shall advise the
Company in writing, that, in its opinion, the number of securities requested and
otherwise proposed to be included in such registration exceeds the Maximum
Offering Size, the Company will include in such registration, in the following
priority, up to the Maximum Offering Size, (1) first, the securities proposed to
be issued by the



                                        7


     Company, (2) second, all Common Shares proposed to be registered for the
     account of the Stockholders and requested to be included in such
     registration, pro rata in accordance with the number of Common Shares
     proposed to be registered by such Stockholders and (3) third, all Common
     Shares proposed to be registered for the account of other Persons, if any,
     having registration rights granted after the date hereof and requested to
     be included in such registration (whether or not such request arises from a
     demand registration right granted to such person), pro rata in accordance
     with the number of Common Shares proposed to be registered by such other
     Persons, or otherwise allocated among such Persons in such proportion as
     such Persons and the Company shall agree. Notwithstanding the foregoing,
     after the 18 month anniversary of the Closing Date, the Persons referred to
     in clauses (2) and (3) shall include Common Shares in any registration
     pursuant to this Section 2(b) pro rata in accordance with the number of
     Common Shares requested to be included in such registration by all such
     Persons; provided that if, after such 18 month anniversary, a request
     pursuant to this Section 2(b) occurs in respect of an underwritten offering
     made at the request of any other Person pursuant to registration rights
     granted to such Person after the date hereof in connection with the
     issuance by the Company of securities, and the managing underwriter has
     advised the Company in writing, that, in its opinion, the number of
     securities requested and otherwise proposed to be included in such
     registration exceeds the Maximum Offering Size, the Company will include in
     such registration, in the following priority, up to the Maximum Offering
     Size, (1) first, the securities proposed to be registered by such Person
     and (2) second, all Common Shares proposed to be registered for the account
     of other Persons (including the Stockholders), if any, requested to be
     included in such registration pro rata in accordance with the numbers of
     other securities proposed to be registered by the other Persons or
     otherwise allocated among such other Persons in such proportion as such
     holders and the Company shall agree.

     (c)  Registration Procedures. If and whenever the Company is required to
use its reasonable efforts to effect the registration of any Registrable
Securities under the Securities Act as provided in Section 2(a) or Section 2(b)
the Company will as expeditiously as practicable:

             (i)  prepare and file with the Commission the requisite
     registration statement to effect such registration and thereafter use its
     commercially reasonable efforts to cause such registration statement to
     become effective; provided that the Company may postpone the filing or
     effectiveness of a registration for a reasonable period not to exceed 90
     days from the date of the request, if the Board reasonably believes that

                                        8


     such registration might reasonably be expected to have an adverse effect on
     any proposal or plan to engage in any acquisition of assets or capital
     stock or any amalgamation, merger, consolidation, tender offer or similar
     transaction; or would otherwise require disclosure of information which the
     Board in its reasonable judgement determines should not be disclosed;
     provided further that no more than one postponement under this clause (i)
     or termination under clause (ii) below may be imposed in any twelve month
     period.

          (ii)  prepare and file with the Commission such amendments and
     supplements to such registration statement and the prospectus used in
     connection therewith as may be necessary to keep such registration
     statement continuously effective for a period of either (A) 180 days
     (without including in such period the number of days in any Delay Period
     (as hereinafter defined)) or (B) such shorter period as will terminate when
     all of the securities covered by such registration statement have been
     disposed of in accordance with the intended methods of disposition by the
     seller or sellers thereof set forth in such registration statement (but in
     any event not before the expiration of any longer period required under the
     Securities Act), and to comply with the provisions of the Securities Act
     with respect to the disposition of all securities covered by such
     registration statement; provided that the Company may terminate the
     effectiveness of a registration if the Board reasonably believes that such
     registration would reasonably be expected to have an adverse effect on any
     proposal or plan to engage in any acquisition of assets or capital stock or
     any amalgamation, merger, consolidation, tender offer or similar
     transaction or would otherwise require disclosure of information which the
     Board determines in its reasonable judgement should not be disclosed;

         (iii)  furnish to each Requesting Holder such number of conformed
     copies of such registration statement and of each such amendment and
     supplement thereto (in each case including all exhibits, but only one copy
     thereof to each such Requesting Holder), such number of copies of the
     prospectus contained in such registration statement (including each
     preliminary prospectus and any summary prospectus) and any other prospectus
     filed under Rule 424 under the Securities Act, in conformity with the
     requirements of the Securities Act, and such other documents in order to
     facilitate the disposition of the Registrable Securities owned by such
     Requesting Holder, as such Requesting Holder may reasonably request;

          (iv)  use its commercially reasonable efforts to register or qualify
     such Registrable Securities and other securities covered by such

                                        9


     registration statement under such other securities or blue sky laws of such
     jurisdictions as each seller thereof shall reasonably request, to keep such
     registration or qualification in effect for so long as such registration
     statement remains in effect, and to take any other action which may be
     reasonably necessary or advisable to enable such seller to consummate the
     disposition in such jurisdictions of the securities owned by such seller;
     provided that the Company shall not for any such purpose be required to (A)
     qualify generally to do business as a foreign corporation in any
     jurisdiction where it would not otherwise be required to qualify but for
     the requirements of this clause (iv), (B) consent to general service of
     process in any such jurisdiction or (C) subject itself to taxation in such
     jurisdiction;

           (v)  use its commercially reasonable efforts to cause all Registrable
     Securities covered by such registration statement to be registered with or
     approved by such other governmental agencies or authorities as may be
     necessary by virtue of the business and operations of the Company to enable
     the seller or sellers thereof to consummate the disposition of such
     Registrable Securities;

          (vi)  promptly notify each seller of Registrable Securities, at any
     time when a prospectus relating thereto is required to be delivered under
     the Securities Act, upon discovery that, or upon the discovery of the
     happening of any event as a result of which the prospectus included in such
     registration statement, as then in effect, includes an untrue statement of
     a material fact or omits to state any material fact required to be stated
     therein or necessary to make the statements therein not misleading in the
     light of the circumstances under which they were made, and at the request
     of any such seller promptly prepare and furnish to such seller a reasonable
     number of copies of a supplement to or an amendment of such prospectus as
     may be necessary so that, as thereafter delivered to the purchasers of such
     securities, such prospectus shall not include an untrue statement of a
     material fact or omit to state a material fact required to be stated
     therein or necessary to make the statements therein not misleading in the
     light of the circumstances under which they were made;

          (vii)  otherwise use its commercially reasonable efforts to comply
     with all applicable rules and regulations of the Commission, and make
     available to its security holders, as soon as reasonably practicable, an
     earnings statement covering a period of at least twelve months, but not
     more than eighteen months, beginning with the first full calendar month
     after the effective date of such registration statement, which earnings

                                       10


     statement  shall  satisfy  the  provisions  of  Section 11(a) of the
     Securities Act; and

          (viii)  use its commercially reasonable efforts to cause all such
     Registrable Securities covered by such registration statement to be listed
     on any national securities exchange (if such Registrable Securities are not
     already so listed), and on each other securities exchange, on which similar
     securities issued by the Company are then listed, if the listing of such
     Registrable Securities is then permitted under the rules of such exchange.

     The Company may require each seller of Registrable Securities as to which
any registration is being effected to furnish promptly to the Company such
information regarding such seller and such seller's Registrable Securities as
the Company may from time to time reasonably request and such other information
as may be legally required in connection with such registration.

     Each holder of Registrable Securities agrees that upon receipt of any
notice from the Company of the happening of any event of the kind described in
clause (vi) of this Section 2(c), such holder will forthwith discontinue such
holder's disposition of Registrable Securities pursuant to the registration
statement relating to such Registrable Securities until such holder's receipt of
the copies of the supplemented or amended prospectus contemplated by clause (vi)
of this Section 2(c) (a "Delay Period") and, if so directed by the Company, such
holder will deliver to the Company all copies, other than permanent file copies
then in such holder's possession, of the prospectus relating to such Registrable
Securities current at the time of receipt of such notice.

        (d)  Underwritten Offerings. The DLJ Entities will have the right, in
their sole discretion, to select an underwriter or underwriters in connection
with any underwritten offering resulting from the exercise by any DLJ Entity of
a demand for registration under Section 2(a), in which offering the Registrable
Securities to be registered by the DLJ Entities pursuant to Section 2(a)
constitute more than 50% of all Registrable Securities to be registered pursuant
to Section 2(a). Such underwriter or underwriters may include any Affiliate of
any DLJ Entity. The Board shall select, in its sole discretion, the underwriter
or underwriters in connection with any other underwritten offering; provided
that, in any underwritten offering in which Marsh is the Initiating Stockholder,
the lead underwriters of such offering shall be reasonably acceptable to Marsh
and; provided further that, in any underwritten offering in which at least 30%
of the securities to be sold are owned by the DLJ Entities, the DLJ Entities
shall have the right to designate one co-lead underwriter in connection with
such offering (which will not, unless the Company consents, be the book-runner).
Such underwriter may include any Affiliate of any DLJ Entity. The underwriting

                                  11


     agreement shall be reasonably satisfactory in substance and form to the
     Board and shall contain such representations and warranties by the Company
     and by the selling stockholders and such other terms as are generally
     prevailing in agreements of this type, including, without limitation,
     indemnities to the effect and to the extent provided in Section 2(f). No
     Person may participate in any underwritten registration hereunder unless
     such Person (i) agrees to sell such Person's securities on the basis
     provided in any underwriting arrangements reasonably approved by the Board
     that are consistent with the provisions of this Agreement and (ii)
     completes and executes all questionnaires, powers of attorney, indemnities,
     underwriting agreements and other documents reasonably required under the
     terms of such underwriting arrangements and the provisions of this
     Agreement.

          (e) Holdback Agreements. Each holder of Registrable Securities agrees
     for the benefit of the Company, so long as the Company and its controlling
     stockholders agree to be similarly bound, not to effect any sale or
     distribution of any equity securities of the Company, or any securities
     convertible into or exchangeable or exercisable for such securities,
     including a sale pursuant to Rule 144 under the Securities Act (or any
     similar provision then in force), during the 30 day period before the
     effective date of such registration statement (except as part of such
     registration statement) or during the period after such effective date that
     such managing underwriter or the Board, in their reasonable judgement,
     shall agree (but not to exceed 180 days); provided that the transferees in
     any sale not prohibited hereunder (other than as part of such underwritten
     public offering) shall agree to be bound by the terms of this Section 2(e).

          (f) Indemnification.

               (i) Indemnification by the Company. In the event of any
          registration of any securities of the Company under the Securities Act
          pursuant to this Section 2, the Company will, and hereby does,
          indemnify and hold harmless, the seller of any Registrable Securities
          covered by such registration statement, its directors, officers,
          agents and employees, each other Person who participates as an
          underwriter in the offering or sale of such securities and each other
          Person, if any, who controls such seller or any such underwriter
          within the meaning of the Securities Act, against any losses, claims,
          damages or liabilities, joint or several, to which such seller or any
          such director, officer, agent, employee, underwriter or controlling
          person may become subject under the Securities Act or otherwise,
          insofar as such losses, claims, damages or liabilities (or actions or
          proceedings, whether commenced or threatened, in respect thereof)
          arise out of or are based upon (A) any untrue statement or alleged
          untrue statement of any material fact contained (x) in any
          registration statement under which such

                                       12


          securities were registered under the Securities Act, any preliminary
          prospectus, final prospectus or summary prospectus contained therein
          or used in connection with the offering of securities covered thereby,
          or any amendment or supplement thereto or any document included by
          reference therein, or (y) in any application or other document or
          communication (in this Section 2(f) collectively called an
          "application") executed by or on behalf of the Company or based upon
          written information furnished by or on behalf of the Company filed in
          any jurisdiction in order to qualify any securities covered by such
          registration statement under the "blue sky" or securities laws
          thereof, or (B) any omission or alleged omission to state therein a
          material fact required to be stated therein or necessary to make the
          statements therein not misleading, and the Company will reimburse such
          seller and each such director, officer, agent, employee, underwriter
          and controlling person for any legal or any other expenses incurred by
          them in connection with investigating or defending any such loss,
          claim, liability, action or proceeding; provided that the Company
          shall not be liable in any such case to the extent that any such loss,
          claim, damage, liability (or action or proceeding in respect thereof)
          or expense arises out of or is based upon an untrue statement or
          alleged untrue statement, or omission or alleged omission, made in
          such registration statement, any such preliminary prospectus, final
          prospectus, summary prospectus, amendment or supplement, or in any
          application, in reliance upon and in conformity with written
          information prepared and furnished to the Company by such seller
          specifically for use in the preparation thereof which information
          contained any untrue statement of any material fact or omitted to
          state therein a material fact required to be stated therein or
          necessary to make the statements therein not misleading; and provided
          further that the Company shall not be liable to any Person who
          participates as an underwriter in any such registration or any other
          Person who controls such underwriter within the meaning of the
          Securities Act, in any such case to the extent that any such loss,
          claim, damage, liability (or action or proceeding in respect thereof)
          or expense arises out of such Person's failure to send or give a copy
          of the final prospectus, as the same may be then supplemented or
          amended (provided it has been made available to such Person in
          accordance with the terms hereof), to the Person asserting an untrue
          statement or alleged untrue statement or omission or alleged omission
          at or prior to the written confirmation of the sale of the securities
          to such Person if such statement or omission was corrected in such
          final prospectus. Such indemnity shall remain in full force and effect
          regardless of any investigation made by or on behalf of such seller or
          any such director, officer, agent, employee, underwriter or
          controlling Person and shall survive the transfer of such securities
          by such seller. The Company shall not be obligated to pay the fees and
          expenses of more than one

                                       13


          counsel or firm of counsel for all parties indemnified in respect of a
          claim for each jurisdiction in which such counsel is required unless
          in the reasonable judgment of counsel for the indemnified party a
          conflict of interest may exist between such indemnified party and any
          other indemnified party in respect of such claim.

                (ii) Indemnification by the Sellers. The Company may require, as
          a condition to including any Registrable Securities in any
          registration statement filed pursuant to this Section 2, that the
          Company shall have received an undertaking satisfactory to it from the
          prospective seller of such Registrable Securities, to indemnify and
          hold harmless (in the same manner and to the same extent as set forth
          in Section 2(f)(i)) the Company, each director of the Company, each
          officer of the Company and each other Person, if any, who controls the
          Company within the meaning of the Securities Act, with respect to any
          statement or alleged statement in or omission or alleged omission from
          such registration statement, any preliminary prospectus, final
          prospectus or summary prospectus contained therein, or any amendment
          or supplement thereto, or any application, if such statement or
          alleged statement or omission or alleged omission was made in reliance
          upon and in conformity with written information prepared and furnished
          to the Company by such seller, as to such seller, specifically for use
          in the preparation of such registration statement, preliminary
          prospectus, final prospectus, summary prospectus, amendment or
          supplement, or such application, which information contained any
          untrue statement of any material fact or omitted to state therein a
          material fact required to be stated therein or necessary to make the
          statements therein not misleading. Such indemnity shall remain in full
          force and effect, regardless of any investigation made by or on behalf
          of the Company or any such director, officer or controlling Person and
          shall survive the transfer of such securities by such seller. The
          indemnity provided by each seller of securities under this Section
          2(f)(ii) shall be provided severally, and not jointly or jointly and
          severally with any other seller or prospective seller of securities,
          and shall be limited in amount to the net amount of proceeds received
          by such seller from the sale of Registrable Securities pursuant to
          such registration statement.

               (iii) Notices of Claims, etc. Promptly after receipt by an
          indemnified party of notice of the commencement of any action or
          proceeding involving a claim referred to in the preceding subdivisions
          of this Section 2(f), such indemnified party will, if a claim in
          respect thereof is to be made against an indemnifying party, give
          written notice to the latter of the commencement of such action;
          provided that the failure of any indemnified party to give notice as
          provided herein shall not relieve the

                                       14


          indemnifying party of its obligations under the preceding subdivisions
          of this Section 2(f), except to the extent that the indemnifying party
          is materially prejudiced by such failure to give notice. In case any
          such action is brought against an indemnified party, unless in such
          indemnified party's reasonable judgment a conflict of interest between
          such indemnified and indemnifying parties may exist in respect of such
          claim, the indemnifying party shall be entitled to participate in and
          to assume the defense thereof, jointly with any other indemnifying
          party similarly notified to the extent that it may wish, with counsel
          reasonably satisfactory to such indemnified party. No indemnifying
          party shall, without the consent of the indemnified party, consent to
          entry of any judgment or enter into any settlement which does not
          include as an unconditional term thereof the giving by the claimant or
          plaintiff to such indemnified party of a release from all liability in
          respect to such claim or litigation.

               (iv)  Other Indemnification. Indemnification similar to that
          specified in the preceding subdivisions of this Section 2(f) (with
          appropriate and reasonable modifications) shall be given by the
          Company and each seller of Registrable Securities with respect to any
          required registration or other qualification of securities under any
          federal, state or provincial law or regulation of any governmental
          authority, other than the Securities Act.

                (v)  Indemnification Payments. The indemnification required by
          this Section 2(f) shall be made by periodic payments of the amount
          thereof during the course of the investigation or defense, as and when
          bills are received or expense, loss, damage or liability is incurred,
          subject to refund if the party receiving such payments is subsequently
          found not to have been entitled thereto hereunder.

               (vi)  Contribution. In order to provide for just and equitable
          contribution in circumstances under which the indemnity contemplated
          by this Section 2(f) is for any reason not available, the parties
          required to indemnify by the terms hereof shall contribute to the
          aggregate losses, liabilities, claims, damages and expenses of the
          nature contemplated by such indemnity agreement incurred by the
          Company, any seller of Registrable Securities and one or more of the
          underwriters, except to the extent that contribution is not permitted
          under Section 11(f) of the Securities Act. In determining the amounts
          which the respective parties shall contribute, there shall be
          considered the relative benefits received by each party from the
          offering of the Registrable Securities (taking into account the
          portion of the proceeds of the offering realized by each), the
          parties' relative knowledge and access to information concerning the

                                       15


          matter with respect to which the claim was asserted, the opportunity
          to correct and prevent any statement or omission and any other
          equitable considerations appropriate under the circumstances. The
          Company and each Person selling securities agree with each other that
          no seller of Registrable Securities shall be required to contribute
          any amount in excess of the amount such seller would have been
          required to pay to an indemnified party if the indemnities under
          clauses (i) and (ii) above of this Section 2(f) were available. The
          Company and each such seller agree with each other and the
          underwriters of the Registrable Securities, if requested by such
          underwriters, that it would not be equitable if the amount of such
          contribution were determined by pro rata or per capita allocation
          (even if the underwriters were treated as one entity for such purpose)
          or for the underwriters' portion of such contribution to exceed the
          percentage that the underwriting discount bears to the initial public
          offering price of the Registrable Securities. For purposes of this
          clause (vi), each Person, if any, who controls an underwriter within
          the meaning of Section 15 of the Securities Act shall have the same
          rights to contribution as such underwriter, and each director and each
          officer of the Company who signed the registration statement, and each
          Person, if any, who controls the Company or a seller of Registrable
          Securities within the meaning of Section 15 of the Securities Act
          shall have the same rights to contribution as the Company or a seller
          of Registrable Securities, as the case may be.

          SECTION 3. Other Registration Rights. Notwithstanding anything to the
contrary in this Agreement, the Company shall be permitted to grant to any
Person the right to request that the Company to register any equity securities
of the Company, or any securities convertible or exchangeable into or
exercisable for such securities, without the consent of holders of any
Registrable Securities, so long as no such registration rights conflict with or
are senior to, or would result in a delay in exercise or consummation of, the
rights granted pursuant to Section 2(a) or Section 2(b) hereunder (other than in
the manner contemplated by the final sentence of Section 2(b)(iii)).

          SECTION 4. Markel Guarantee. Markel hereby guarantees the performance
by the Company of all of its obligations under this Agreement and agrees to
cause the Company to execute a counterpart of this Agreement upon its
organization.

          SECTION 5. Amendments and Waivers. This Agreement may be amended and
the Company may take any action herein prohibited, or omit to perform any act
herein required to be performed by it, only if the Company shall have obtained
the written consent to such amendment, action or omission to act of the holders
of


                                       16


          at least a  majority  of all  Registrable  Securities  held by the DLJ
          Entities, on the one hand, and by Marsh, on the other hand.

               SECTION 6. Notices. All communications provided for hereunder
          shall be in writing and shall be delivered personally or by facsimile
          or sent by first-class mail and addressed to Marsh and Byrne at the
          address that each, respectively, shall have furnished to the Company
          in writing, and

               if to the Company to:


                       Virginia Holdings Inc.
                       c/o Markel Corporation
                       451 Cox Road
                       Glen Allen, Virginia 23059
                       Attention:    Steven A. Markel
                       Facsimile:    (804) 527-3810

               and with a copy to:

                       McGuire, Woods, Battle & Boothe LLP
                       One James Center
                       Richmond, Virginia 23219
                       Attention:    Leslie A. Grandis
                       Facsimile:    (804) 775-1061

               and if to any DLJ Entity to:

                       DLJ Merchant Banking
                       277 Park Avenue
                       New York, New York 10172
                       Attention:    David L. Jaffe

               and with a copy to:

                       Davis Polk & Wardwell
                       450 Lexington Avenue
                       New York, New York 10017
                       Attention:    George R. Bason, Jr.
                       Facsimile:    (212) 450-4800

               SECTION 7. Binding Agreement. This Agreement shall be binding
          upon and inure to the benefit of and be enforceable by the parties
          hereto and their respective successors and assigns; provided that the
          rights accorded the DLJ


                                       17


          Entities herein shall not inure to the benefit of any transferee or
          subsequent holder of any Registrable Securities, except to a Permitted
          Transferee acquiring Registrable Securities who has executed and
          delivered to the Company an agreement to be bound by this Agreement.
          Any such Permitted Transferee shall thereafter have all the rights
          accorded to the DLJ Entities hereunder. Notwithstanding the foregoing,
          (i) no Permitted Transferee obtaining its Registrable Securities as a
          result of a distribution in kind to all or substantially all of the
          limited partners of any DLJ Entity shall be entitled to the benefits
          of this Agreement (ii) no DLJ Partner or DLJ Associate may be an
          Initiating Stockholder, and (iii) all notices to any Permitted
          Transferee shall be deemed to have been satisfactorily given for
          purposes of this Agreement if given to DLJ Merchant Banking, Inc. at
          277 Park Avenue, New York, New York 10172; Attention: David L. Jaffe;
          Facsimile No: 212-892-7552, which shall have sole responsibility for
          giving notice to such Permitted Transferees and coordinating the
          participation by such Permitted Transferees in any registration of
          Registrable Securities pursuant hereto.

               SECTION 8. Descriptive Headings. The descriptive headings of the
          several sections and paragraphs of this Agreement are inserted for
          reference only and shall not limit or otherwise affect the meaning
          hereof.

               SECTION 9. Specific Performance. The parties hereto recognize and
          agree that money damages may be insufficient to compensate the holders
          of any Registrable Securities for breaches by the Company of the terms
          hereof and, consequently, that the equitable remedy of specific
          performance of the terms hereof will be available in the event of any
          such breach.

               SECTION 10. Effectiveness. This Agreement shall be effective as
          of the Closing Date (as defined in the Merger Agreement) and the TNA
          Registration Rights Agreement shall automatically terminate as of such
          date.

               SECTION 11. Termination. This Agreement shall automatically
          terminate on the earlier of: (i) the date that is five years from the
          Closing Date (as defined in the Merger Agreement) or (ii), if the
          Closing Date does not occur, the termination of the Merger Agreement.

               SECTION 12. Governing Law. All questions concerning the
          construction, validity and interpretation of this agreement will be
          construed and enforced in accordance with, and the rights of the
          parties shall be governed by, the internal laws, and not the law of
          conflicts, of the State of New York.

               SECTION 13. Counterparts. This Agreement may be executed
          simultaneously in any number of counterparts, each of which shall be
          deemed an


                                               18


          original, but all such counterparts shall together constitute one and
          the same instrument.

               SECTION 14. Entire Agreement. This Agreement, together with the
          Merger Agreement, is intended by the parties hereto as a final
          expression of their agreement and intended to be a complete and
          exclusive statement of their agreement and understanding in respect to
          the subject matter contained herein. This Agreement supersedes all
          prior agreements and understandings between the parties with respect
          to such subject matter.

                                       19



               IN WITNESS WHEREOF,  the parties have caused this Agreement to be
          executed and delivered as of the date first above written.

                                             MARKEL CORPORATION

                                             By:     /s/ Steven A. Markel
                                                -------------------------------
                                                Name: Steven A. Markel
                                                Title: Vice Chairman


                                             VIRGINIA HOLDINGS INC.


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

                                       20


                                              DLJ INTERNATIONAL PARTNERS, C.V.
                                              By: DLJ MERCHANT BANKING, INC.
                                                  Advisory General Partner

                                              By: /s/ David Jaffe
                                                 ------------------------------
                                                 Name: David Jaffe
                                                 Title: Managing Director

                                              DLJ OFFSHORE PARTNERS, C.V.
                                              By: DLJ MERCHANT BANKING, INC.
                                                  Advisory General Partner

                                              By: /s/ David Jaffe
                                                 ------------------------------
                                                  Name: David Jaffe
                                                  Title: Managing Director

                                              DUMB OVERSEAS PARTNERS, C.V.
                                              By: DLJ MERCHANT BANKING, INC.
                                                  Advisory General Partner

                                              By: /s/ David Jaffe
                                                 ------------------------------
                                                  Name: David Jaffe
                                                  Title: Managing Director



                                       21


                                            DLJ MERCHANT BANKING
                                             FUNDING, INC.

                                            By: /s/ Ivy Dodes
                                                -------------------------------
                                                Name: Ivy Dodes
                                                Title: Vice President

                                            DLJ FIRST ESC, L.P.
                                            By: DLJ LBO PLANS MANAGEMENT
                                                CORPORATION, its General Partner

                                            By: /s/ Ivy Dodes
                                                -------------------------------
                                                Name: Ivy Dodes
                                                Title: Vice President

                                            DONALDSON, LUFKIN & JENRETTE
                                             SECURITIES CORPORATION

                                            By; /s/ Ivy Dodes
                                                -------------------------------
                                                Name: Ivy Dodes
                                                Title: Vice President






                                           MARSH & MCLENNAN CAPITAL, INC. on
                                           behalf of itself, MARSH &
                                           MCLENNAN RISK CAPITAL HOLDINGS,
                                           LTD., other related MARSH & MCLENNAN
                                           CAPITAL. INC. entities and RISK
                                           CAPITAL REINSURANCE COMPANY


                                           By:  /s/ Philip Petronis
                                              --------------------------------
                                              Name: Philip Petronis
                                              Title:


                                       23


                                             JOHN J. BYRNE, on his own behalf
                                             and on behalf of certain entities
                                             as to which, with respect to Common
                                             Shares held by such entities, he
                                             has voting and dispositive power


                                             /s/ John J. Byrne
                                             ----------------------------------
                                      24