Exhibit 99.3

               CERTIFICATE OF DESIGNATION, PREFERENCES AND RIGHTS
                                       OF
               SERIES B CUMULATIVE CONVERTIBLE PERPETUAL PREFERRED
                                     SHARES
                                       OF
                               TRENWICK GROUP LTD.

      The Series B Cumulative Convertible Perpetual Preferred Shares shall have
the designation, preferences and rights, and shall be subject to the
restrictions, as hereinafter appearing:

      Section 1. Designation and Amount. There shall be a series of preferred
shares of the Company which shall be designated as "Series B Cumulative
Convertible Perpetual Preferred Shares," par value $0.10 per share (hereinafter
called "Series B Preferred Shares"), and the number of shares constituting such
series shall be 550,000. Such number of shares may be increased or decreased at
any time and from time to time by resolution of the Company's Board of
Directors; provided, however, that no decrease shall reduce the number of shares
of Series B Preferred Shares to a number less than the number of shares then
outstanding plus the number of shares of Series B Preferred Shares issuable upon
exercise of outstanding rights, options or warrants or upon conversion of
outstanding securities issued by the Company.

      Section 2. Definitions. For purposes of the Series B Preferred Shares, the
following terms shall have the meanings indicated:

            "Affiliate" of, or a person "affiliated" with, a specified Person
      means a Person that directly, or indirectly through one ore more
      intermediaries, controls or is controlled by, or is under common control
      with, such specified Person.

            "Applicable Rate" shall mean, for any particular Dividend Period, a
      rate per annum equal to LIBOR plus the Average Credit Rate.

            "Average Credit Rate" shall mean, for any particular Dividend
      Period, a rate per annum (rounded, if necessary, to the next higher 1/100
      of 1.0%, if it is not such a multiple) equal to (i) the sum of the
      products of each Credit Rate that was applicable to any portion of such
      Dividend Period multiplied by the number of days during such Dividend
      Period to which such Credit Rate was applicable (ii) divided by the total
      number of days in such Dividend Period.

            "Board" shall mean the Board of Directors of the Company or any
      committee authorized by such Board of Directors to perform any of its
      responsibilities with respect to the Series B Preferred Shares.

            "Book Value Per Common Share" shall mean (A) divided by (B); where
      (A) is defined as the Company's GAAP Net Worth as of the end of the most
      recent fiscal quarter preceding any Conversion Date less (1) the sum of
      the aggregate liquidation preferences for all series of preferred shares
      of the Company



      then outstanding and less (2) the sum of all due but undeclared dividends
      as of the end of such fiscal quarter on all series of preferred shares of
      the Company which are not convertible by their terms into Common Shares;
      and where (B) is defined as the number of Common Shares outstanding as of
      the end of such fiscal quarter on a fully diluted basis in accordance with
      GAAP; provided, however, that the dilution calculation shall be made as if
      Series B Preferred Shares were not convertible into Common Shares.

            "Business Day" shall mean any day other than a Saturday, Sunday or a
      day on which banking institutions in any of Hamilton, Bermuda; Zurich,
      Switzerland; Chicago, U.S.; or London, England are not required to be
      open.

            "Change of Control" shall mean the earliest to occur of (a) the date
      that a Person or group of affiliated Persons (an "Acquiring Person") has
      acquired, or has obtained the right to acquire, legal or beneficial
      ownership of fifty percent (50%) or more of the voting power of the issued
      and outstanding shares of Company, (b) the date an Acquiring Person
      acquires fifty percent (50%) or more of the assets of Company, or (c) the
      date of any amalgamation, consolidation or merger of Company with any
      Acquiring Person. For purposes hereof, the term "Acquiring Person" shall
      not include (i) Trenwick, any of its Subsidiaries or any employee benefit
      plan (or related trust) sponsored or maintained by Company, or any of its
      subsidiaries, or (ii) any other person where fifty percent (50%) or more
      of the combined voting power of such Person's issued and outstanding
      shares or capital stock is beneficially owned, directly or indirectly, by
      the Persons who were the holders of the voting shares of Company
      immediately prior to such acquisition, amalgamation, consolidation or
      merger (as the case may be).

            "Change of Control Conversion Event" shall mean the occurrence of a
      Change of Control without the written consent of the registered holders of
      more than 50% of the Series B Preferred Shares then outstanding.

            "Common Shares" shall mean the common shares of the Company, par
      value $0.10 per share.

            "Company" shall mean Trenwick Group Ltd., and where an obligation or
      duty is placed on the Company or the Company is authorized to do any act
      then such obligation, duty or act may be carried out by the Board.

            "Conversion Date," with respect to Series B Preferred Shares for
      which there is a proposed Conversion Date, shall be the same day as the
      Proposed Conversion Date, provided that (i) the holder of such Series B
      Preferred Shares shall not have delivered a notice of revocation in
      accordance with paragraph (c) of Section 6 hereof and (ii) the Company
      shall not have given a notice of redemption pursuant to paragraph (b) of
      Section 5 hereof naming any date on or prior to the Proposed Conversion
      Date as the Proposed Redemption Date, and such notice to redeem shall not
      have been revoked prior to such date; provided, further, that in the event
      that the holders of more than 50% of the outstanding Series B Preferred


                                      -2-


      Shares hold registration rights with respect to Common Shares into which
      such Series B Preferred Shares can be converted, and such holders have
      delivered to the Company, concurrently with any notice of conversion under
      paragraph (b) of Section 6 hereof, a notice requesting registration of
      such Common Shares for sale in a public offering, then the Conversion Date
      shall be delayed so that it occurs on or immediately prior to the
      effective date of such registration.

            "Conversion Price" shall mean, with respect to any particular
      Conversion Date, the greatest of (i) the product of the Liquidity Factor
      multiplied by the average Current Market Price for the Common Shares for
      the 30 consecutive Trading Days immediately preceding such Conversion
      Date, (ii) the product of the Liquidity Factor multiplied by the Book
      Value Per Common Share or (iii) the par value of a Common Share.

            "Credit Rate" shall mean, for any particular day, the lowest of the
      Percentage Amounts corresponding to the S&P Credit Rating for such day as
      set forth in the following table:

            -------------------------------------------------------------

             S&P Credit Rating                          Percentage Amount

            -------------------------------------------------------------

               BBB- or above                                  3.75%

            -------------------------------------------------------------

                    BB+                                       4.25%

            -------------------------------------------------------------

                     BB                                       4.50%

            -------------------------------------------------------------

                    BB-                                       4.75%

            -------------------------------------------------------------

            Below BB- or Unrated                              6.00%

            -------------------------------------------------------------

      If, after the third anniversary of any Issue Date, the Series B Preferred
      Shares have no rating, or an S&P Credit Rating below BBB-, all Percentage
      Amounts listed above shall be increased as of such third anniversary by
      0.25% with respect to all Series B Preferred Shares issued on such Issue
      Date. If, after the fifth anniversary of any Issue Date, the Series B
      Preferred Shares have no rating, or an S&P Credit Rating below BBB-, all
      Percentage Amounts listed above (as adjusted per the previous sentence, if
      applicable) shall be increased as of such fifth anniversary by 0.50% with
      respect to all Series B Preferred Shares issued on such Issue Date. In no
      case, however, shall the total adjustment to any Percentage Amount
      pursuant to this paragraph exceed 0.75%. Only an S&P Credit Rating, shall
      be utilized for determining adjustments to any Percentage


                                      -3-


      Amount, and the Series B Preferred Shares shall be deemed unrated if they
      do not have an S&P Credit Rating.

            "Current Market Price" of publicly traded common shares or any other
      class of capital stock or other security of the Company or any other
      issuer for any day shall mean the last reported sales price, regular way
      on such day, or, if no sale takes place on such day, the average of the
      reported closing bid and asked prices on such day, regular way, in either
      case as reported on the New York Stock Exchange ("NYSE") or, if such
      security is not listed or admitted for trading on the NYSE, on the
      principal national securities exchange on which such security is listed or
      admitted for trading or, if not listed or admitted for trading on any
      national securities exchange, on the National Market System of the
      National Association of Securities Dealers, Inc. Automated Quotations
      System ("Nasdaq") or, if such security is not quoted on such National
      Market System, the average of the closing bid and asked prices on such day
      in the over-the-counter market as reported by Nasdaq or, if bid and asked
      prices for such security on such day shall not have been reported through
      Nasdaq, the average of the bid and asked prices on such day as furnished
      by any NYSE member firm regularly making a market in such security
      selected for such purpose by the Board or, if no NYSE member firm shall be
      regularly making a market in such security, such price as may be
      determined by the Board in good faith.

            "Dividend Payment Date" shall mean the first day of January, April,
      July and October in each year; provided, however, that if any Dividend
      Payment Date falls on any day other than a Business Day, the dividend
      payment due on such Dividend Payment Date shall be paid on the Business
      Day immediately following such Dividend Payment Date.

            "Dividend Periods" shall mean quarterly dividend periods commencing
      on January 1, April 1, July 1 and October 1 of each year and ending on and
      including the day preceding the first day of the next succeeding Dividend
      Period (other than the initial Dividend Period, which shall commence on
      the Issue Date, and other than the Dividend Period during which any Series
      B Preferred Shares shall be redeemed pursuant to Section 5 hereof, which
      shall end on and include the Redemption Date with respect to the Series B
      Preferred Shares being redeemed).

            "Dollars" or "$" shall mean U.S. Dollars.

            "Early Redemption Premium" shall mean, with respect to any
      redemption pursuant to Section 5 hereof, an amount equal to (i) $2.00 per
      share if the Redemption Date for such redemption falls before the second
      anniversary of the Issue Date, (ii) $1.00 per share if such Redemption
      Date falls on or after the second anniversary of the Issue Date but before
      the third anniversary of the Issue Date, and (iii) zero if such Redemption
      Date falls on or after the third anniversary of the Issue Date.

            "Excess Preferred Shares" shall have the meaning set forth in
      Section 11(a) hereof.


                                      -4-


            "Fully Junior Shares" shall mean the Common Shares and any other
      class or series of shares of the Company's stock now or hereafter issued
      and outstanding over which the Series B Preferred Shares have preference
      or priority in both (i) the payment of dividends and (ii) the distribution
      of assets on any liquidation, dissolution or winding up of the Company.

            "GAAP" shall mean U.S. generally accepted accounting principles,
      consistently applied.

            "GAAP Net Worth" shall mean the amount equal to the a company's
      consolidated shareholders' equity plus minority interest, if any, as
      determined in accordance with GAAP.

            "Issue Date" shall mean, with respect to any particular Series B
      Preferred Shares, the date on which such shares are issued by the Company.

            "Junior Shares" shall mean the Common Shares, any Fully Junior
      Shares and any other class or series of shares of the Company's stock now
      or hereafter issued and outstanding over which the Series B Preferred
      Shares have preference or priority in either (i) the payment of dividends
      or (ii) the distribution of assets on any liquidation, dissolution or
      winding up of the Company.

            "LIBOR" shall mean, for any particular Dividend Period, the offered
      rate for deposits in U.S. Dollars, for a one-year period and in an amount
      comparable to the aggregate Liquidation Preference of the Series B
      Preferred Shares then outstanding, appearing on the Reuters Screen LIBO
      Page as of 11:00 A.M. (London, England time) on the day that is two
      Business Days prior to the Reference Date. If two or more of such rates
      appear on the Reuters Screen LIBO Page, the rate for that Dividend Period
      shall be the arithmetic mean of such rates. If the foregoing rate is
      unavailable from the Reuters Screen for any reason, then such rate shall
      be determined by the Company from Telerate Page 3750 or, if such rate is
      also unavailable on such service, then on any other interest rate
      reporting service of recognized standing designated in writing by the
      Company to the holders of the Series B Preferred Shares; in any such case
      rounded, if necessary, to the next higher 1/100 of 1.0%, if the rate is
      not such a multiple.

            "Liquidation Preference" shall mean $100.00 per Series B Preferred
      Share.

            "Liquidity Factor" shall mean, with respect to any conversion
      pursuant to Section 6 hereof, an amount equal to (i) 0.80 if the
      Conversion Date for such conversion falls 60 days or more after the
      occurrence of a Change of Control Conversion Event or (ii) 1.00 if such
      Conversion Date does not fall 60 days or more after the occurrence of a
      Change of Control Conversion Event.

            "Net Worth Conversion Event" shall mean the failure by the Company
      to maintain a GAAP Net Worth equal to at least $225,000,000 excluding
      contingent interest notes and outstanding trust preferred stock) which
      failure shall not have been remedied within 60 days after the earlier of
      (i) the Company's Chief Financial Officer (if there be such an officer,
      and if not then the Company's President or Chairman) obtaining actual


                                      -5-


      personal knowledge thereof, whereupon such officer shall give written
      notice to all holders of Series B Preferred Shares, or (ii) the Company's
      receipt of written notice thereof from any holder of Series B Preferred
      Shares.

            "Parity Shares" shall mean (i) the Series B Preferred Shares and
      (ii) any other class or series of shares of the Company's stock now or
      hereafter issued and outstanding, whether or not the dividend rates,
      dividend payment dates or redemption or liquidation prices per share
      thereof shall be different from those of the Series B Preferred Shares, if
      the holders thereof shall be entitled, together with the holders of the
      Series B Preferred Shares, to the receipt of dividends and of amounts
      distributable upon liquidation, dissolution or winding up in proportion to
      their respective amounts of accrued and unpaid dividends per share or
      liquidation preferences, without preference or priority one over the
      other.

            "Person" shall mean any individual, firm, partnership, corporation,
      limited liability company or other entity, and shall include any successor
      (by merger or otherwise) of such entity.

            "Prohibited Transferees" shall have the meaning set forth in Section
      10(c) hereof.

            "Proposed Conversion Date" shall mean the date on which a holder of
      Series B Preferred Shares proposes to convert any or all of the Series B
      Preferred Shares, as set forth in its notice to the Company properly
      delivered in accordance with paragraph (b) of Section 6 hereof.

            "Proposed Redemption Date" shall mean the date on which the Company
      proposes to redeem any or all of the Series B Preferred Shares, as set
      forth in its notice to holders of Series B Preferred Shares given in
      accordance with paragraph (b) of Section 5 hereof.

            "Redemption Date," with respect to Series B Preferred Shares for
      which there is a Proposed Redemption Date, shall be the same day as the
      Proposed Redemption Date, provided that (i) the Company shall not have
      withdrawn its intention to redeem such Series B Preferred Shares pursuant
      to paragraph (c) of Section 5 hereof; and (ii) proper provision for the
      payment of the Redemption Price to holders of Series B Preferred Shares
      being redeemed shall have been made in accordance with paragraph (f) of
      Section 5 hereof by the close of business on the Proposed Redemption Date.

            "Redemption Price" for each Series B Preferred Share shall be equal
      to the Liquidation Preference plus any applicable Early Redemption Premium
      plus any amounts payable pursuant to paragraph (e) of Section 5 hereof.

            "Reference Date" shall mean, with respect to any particular Dividend
      Period, the later of the Issue Date or the date that is, on the last day
      of such Dividend Period, the most recent anniversary of the Issue Date.

            "Register of Members" shall mean the Register of Members of the
      Company.


                                      -6-


            "Repurchase Date" shall have the meaning set forth in Section 11(a)
      hereof.

            "Repurchase Notice" shall have the meaning set forth in Section
      11(a) hereof.

            "Reuters Screen" shall mean, when used in connection with any
      designated page and LIBOR, the display page so designated on the Reuters
      Monitor Money Rates Service (or such other page as may replace that page
      on that service for the purpose of displaying rates comparable to LIBOR).

            "S&P Credit Rating" shall mean, for any particular day, the risk
      rating then assigned to the Series B Preferred Shares (subject to ongoing
      surveillance and adjustment) by the Standard & Poor's Division of The
      McGraw Hill Companies (or any successor organization or any substitute
      rating organization that may be agreed upon in writing by the Company and
      the registered holders of more than 50% of the outstanding Series B
      Preferred Shares); provided, however, that in the event that no such
      rating is assigned or that such rating has not been confirmed within the
      previous 364 days, the S&P Credit Rating shall be deemed to be "Unrated."

            "Securities Act" shall mean the United States Securities Act of
      1933, as amended, and all rules and regulations promulgated thereunder.

            "Series B Preferred Shares" shall have the meaning set forth in
      Section 1 hereof.

            "set apart for payment" shall be deemed to include, without any
      action other than the following, the recording by the Company in its
      accounting ledgers of any accounting or bookkeeping entry which indicates,
      pursuant to a declaration of dividends or other distribution by the Board,
      the allocation of funds to be so paid on any class or series of shares of
      the Company's stock; provided, however, that if any funds for any class or
      series of Junior Shares or any class or series of shares of the Company's
      stock ranking on a parity with the Series B Preferred Shares as to the
      payment of dividends or other distributions are placed in a separate
      account of the Company or delivered to a disbursing, paying or other
      similar agent, then "set apart for payment" with respect to the Series B
      Preferred Shares shall mean placing such funds in a separate account or
      delivering such funds to a disbursing, paying or other similar agent.

            "Special Conversion Event" shall mean the earlier to occur of a
      Change of Control Conversion Event or a Net Worth Conversion Event.

            "Special Redemption Event" shall mean the earlier to occur of (i) a
      Change of Control Conversion Event or (ii) any date on which the Company
      submits to the holders of its Common Shares a proposal for amalgamation,
      consolidation, merger, statutory share exchange or any proposal for any
      other matter that requires for its validation or effectuation an
      affirmative vote of the holders of the Series B Preferred Shares at the
      time outstanding, acting as a single class.

            "Subsidiary" shall mean, with respect to any Person, any corporation
      or other entity (including, without limitation, partnerships, joint
      ventures, and associations) regardless of its jurisdiction of organization
      or formation, at least a majority of the total


                                      -7-


      combined voting power of all classes of voting stock or other ownership
      interests of which shall, at the time as of which any determination is
      being made, be owned by such Person, either directly or indirectly through
      one or more other Subsidiaries.

            "Telerate" shall mean, when used in connection with any designated
      page and LIBOR, the display page so designated on the Dow Jones Telerate
      Service (or such other page as may replace that page on that service for
      the purpose of displaying rates comparable to LIBOR).

            "Trading Day" shall mean any day on which the securities in question
      are traded on the NYSE, or if such securities are not listed or admitted
      for trading on the NYSE, on the principal national securities exchange on
      which such securities are listed or admitted, or if not listed or admitted
      for trading on any national securities exchange, on the National Market
      System of Nasdaq, or if such securities are not quoted on such National
      Market System, in the applicable securities market in which the securities
      are traded.

            "Transfer Agent" shall mean First Chicago Trust Company of New York,
      or such other agent or agents of the Company as may be designated by the
      Board or its designee as the transfer agent, registrar and dividend
      disbursing agent for the Series B Preferred Shares.

            "U.S." shall mean the United States of America.

            "U.S. Person" shall mean an individual who is a citizen or resident
      of the U.S., a corporation, limited liability company or partnership
      created or organized under the laws of the U.S. or any state thereof, or
      an estate or trust, all of the income of which is includable in gross
      income for U.S. federal income tax purposes, regardless of its source.

            Section 3. Dividends.

            (a) The holders of Series B Preferred Shares shall be entitled to
      receive, when, as and if declared by the Board out of funds legally
      available for the payment of dividends, cumulative preferential dividends
      payable in cash. Such dividends shall begin to accrue and shall be fully
      cumulative from the Issue Date, whether or not in any Dividend Period or
      Periods there shall be funds of the Company legally available for the
      payment of such dividends and whether or not such dividends shall be
      declared. Such dividends shall be payable quarterly, when, as and if
      declared by the Board, in arrears on Dividend Payment Dates, commencing on
      the first Dividend Payment Date after the Issue Date. Each such dividend
      shall be payable in arrears to the holders of record of Series B Preferred
      Shares, as they appear in the Register of Members at the close of business
      on such record dates, not less than 30 nor more than 60 days preceding
      such Dividend Payment Dates thereof, as shall be fixed by the Board.
      Accrued and unpaid dividends for any past Dividend Periods may be declared
      and paid at any time and for such interim periods, without reference to
      any regular Dividend Payment Date, to holders of record on such date, not
      less than 30 nor more than 60 days preceding the payment date thereof, as
      may be fixed by the Board. Any dividend payment made on Series B Preferred
      Shares


                                      -8-


      shall first be credited against the earliest accrued but unpaid dividend
      due with respect to Series B Preferred Shares which remains payable.

            (b) The amount of dividends per share payable for each full Dividend
      Period shall be computed by dividing the Applicable Rate for such Dividend
      Period by four and multiplying the result by the Liquidation Preference.
      The amount of dividends per share payable for the initial Dividend Period,
      or any other period shorter than a full Dividend Period, shall be computed
      by dividing the Applicable Rate by 360 and multiplying the result by the
      number of days in such Dividend Period (computed on the basis of twelve
      30-day months) and then multiplying the latter result by the Liquidation
      Preference. Holders of Series B Preferred Shares shall not be entitled to
      any dividends, whether payable in cash, property or stock, in excess of
      cumulative dividends, as herein provided, on the Series B Preferred
      Shares. No interest, or sum of money in lieu of interest, shall be payable
      in respect of any dividend payment or payments on the Series B Preferred
      Shares that may be in arrears.

            (c) So long as any Series B Preferred Shares are outstanding, no
      dividends or other distributions, except as described in the immediately
      following sentence, shall be declared or paid or set apart for payment on
      any class or series of Parity Shares for any period unless full cumulative
      dividends have been or contemporaneously are declared and paid or declared
      and a sum sufficient for the payment thereof set apart for such payment on
      the Series B Preferred Shares for all Dividend Periods terminating on or
      prior to the dividend payment date in respect of the dividend or other
      distribution on such class or series of Parity Shares. When dividends on
      the Series B Preferred Shares are not paid in full or a sum sufficient for
      such payment is not set apart for payment, as aforesaid, all dividends
      declared upon Series B Preferred Shares and all dividends declared upon
      any class or series of Parity Shares shall be declared ratably in
      proportion to the respective amounts of dividends accumulated and unpaid
      on the Series B Preferred Shares and accumulated and unpaid on such Parity
      Shares.

            (d) So long as any Series B Preferred Shares are outstanding, no
      dividends or other distributions (other than dividends or distributions
      paid solely in shares of, or options, warrants or rights to subscribe for
      or purchase shares of, Fully Junior Shares) shall be declared or paid or
      set apart for payment and no other distribution shall be declared or paid
      or set apart for payment upon Junior Shares, nor shall any Junior Shares
      be redeemed, purchased or otherwise acquired (other than a redemption,
      purchase or other acquisition of Common Shares made for purposes of an
      employee incentive or benefit plan of the Company or any Subsidiary of the
      Company) for any consideration (or any moneys be paid to or made available
      for a sinking fund for the redemption of any Junior Shares) by the
      Company, directly or indirectly (except by conversion into or exchange for
      Fully Junior Shares), unless in each case (i) the full cumulative
      dividends on all outstanding Series B Preferred Shares and any Parity
      Shares shall have been or contemporaneously are declared and paid or
      declared and set apart for payment for all past Dividend Periods with
      respect to the Series B Preferred Shares and all past dividend periods
      with respect to such Parity Shares and (ii) sufficient funds shall have
      been or contemporaneously are declared and set apart for the payment of
      the dividend for the


                                      -9-


      current Dividend Period with respect to the Series B Preferred Shares and
      the current dividend period with respect to such Parity Shares.

            (e) No dividends on Series B Preferred Shares shall be declared by
      the Board or paid or set apart for payment by the Company at such time as
      the terms and provisions of any agreement of the Company, including any
      agreement relating to its indebtedness, prohibit such declaration, payment
      or setting apart for payment or provide that such declaration, payment or
      setting apart for payment would constitute a breach thereof or a default
      thereunder, or if such declaration, payment or setting apart shall be
      restricted or prohibited by law.

            (f) If there shall be any change in the law, regulation or official
      directive (whether or not having the force of law) or in the
      interpretation by any Bermuda Government authority or court of competent
      jurisdiction which imposes on the Company any condition with respect to
      the Series B Preferred Shares as a result of which any dividend payment is
      required to be reduced, the Company shall give notice to the holders of
      Series B Preferred Shares of such event and all such reductions shall be
      borne in full by the holders of Series B Preferred Shares (but only to the
      extent permitted by law).

            Section 4. Liquidation Rights.

            (a) In the event of any liquidation, dissolution or winding up of
      the Company, whether voluntary or involuntary, before any dividend payment
      or distribution of the assets of the Company (whether capital or surplus)
      shall be made or set apart for payment to the holders of Junior Shares,
      the holders of the Series B Preferred Shares shall be entitled to receive
      the Liquidation Preference for each Series B Preferred Share plus an
      amount equal to all dividends (whether or not declared) accrued and unpaid
      thereon to the date of final distribution to such holders and such holders
      shall not be entitled to any further payment. If, upon any liquidation,
      dissolution or winding up of the Company, the assets of the Company, or
      proceeds thereof, distributable among the holders of the Series B
      Preferred Shares shall be insufficient to pay in full the preferential
      amount aforesaid and liquidating payments on any shares of any class or
      series of Parity Shares, then such assets, or the proceeds thereof, shall
      be distributed among the holders of Series B Preferred Shares and any such
      Parity Shares ratably in accordance with the respective amounts that would
      be payable on such Series B Preferred Shares and any such Parity Shares if
      all amounts payable thereon were paid in full. For the purposes of this
      Section 4, (i) an amalgamation, consolidation or merger of the Company
      with one or more corporations or other entities, (ii) a sale, lease or
      conveyance of all or substantially all of the shares of capital stock or
      the property or business of the Company or (iii) a statutory share
      exchange shall not be deemed to be a liquidation, dissolution or winding
      up, voluntary or involuntary, of the Company.

            (b) Subject to the rights of the holders of shares of any series or
      class or classes of shares of the Company's stock ranking on a parity with
      or prior to the Series B Preferred Shares upon liquidation, dissolution or
      winding up, upon any liquidation, dissolution or winding up of the
      Company, after payment shall have been made in full to the holders of the
      Series B Preferred Shares, as provided in this Section 4, any other


                                      -10-


      series or class or classes of Junior Shares shall, subject to the
      respective terms and provisions (if any) applying thereto, be entitled to
      receive any and all assets remaining to be paid or distributed, according
      to their respective numbers of shares, and the holders of the Series B
      Preferred Shares shall not be entitled to share therein.

            Section 5. Redemption.

            (a) Unless a Special Redemption Event shall have occurred, the
      Series B Preferred Shares shall not be redeemable prior to the first
      anniversary of the Issue Date. At any time and from time to time on or
      after such anniversary or at any time after the occurrence of a Special
      Redemption Event, the Company may, at its option, with proper notice as
      set forth in paragraph (b) of this Section 5, redeem any or all of the
      outstanding Series B Preferred Shares, as of a Proposed Redemption Date
      specified in the notice to holders, for cash in an amount equal to the
      Redemption Price per share, subject to a minimum aggregate Redemption
      Price of $10,000,000 for all Series B Preferred Shares to be redeemed
      (which minimum shall not apply if the Company elects to redeem all of the
      Series B Preferred Shares then outstanding). Notwithstanding anything to
      the contrary in this paragraph (a), the Company may provide notice of its
      intention to redeem any Series B Preferred Shares prior to the first
      anniversary of the Issue Date, so long as the Proposed Redemption Date
      specified in such notice is a date on or after the date of such first
      anniversary.

            (b) In order to effect the redemption of Series B Preferred Shares,
      the Company shall provide notice by first-class mail to each holder of
      record of Series B Preferred Shares to be redeemed at the address of each
      such holder as shown in the Register of Members, not less than 30 nor more
      than 90 days prior to the Proposed Redemption Date. Neither the failure to
      mail any notice required by this paragraph (b), nor any defect therein or
      in the mailing thereof, to any particular holder, shall affect the
      sufficiency of the notice or the validity of the proceedings for
      redemption with respect to the other holders. Any notice that was mailed
      in the manner herein provided shall be conclusively presumed to have been
      duly given on the date when the same would be delivered in the ordinary
      course of transmission, whether or not the holder receives the notice.
      Each such mailed notice shall state, as appropriate: (1) the Proposed
      Redemption Date; (2) the number of Series B Preferred Shares to be
      redeemed and, if fewer than all the Series B Preferred Shares held by such
      holder are to be redeemed, the number of such shares to be redeemed from
      such holder; (3) the Redemption Price; (4) the place or places at which
      certificates for such shares are to be surrendered; and (5) that dividends
      on the Series B Preferred Shares to be redeemed shall cease to accrue on
      such Proposed Redemption Date except as otherwise provided herein.

            (c) The Company's election to redeem the Series B Preferred Shares
      pursuant to paragraph (a) of this Section 5 shall be fully or partially
      revocable, and any notice to holders of Series B Preferred Shares provided
      in accordance with paragraph (b) of this Section 5 shall be subject to
      revocation or amendment by the Company. In order to effect the revocation
      or amendment of such notice, the Company shall provide notice of its
      revocation or amendment by first-class mail to holders of record of the
      Series B Preferred Shares previously notified of the proposed redemption
      at the address of each


                                      -11-


      such holder as shown in the Register of Members, not less than three
      Business Days prior to the Proposed Redemption Date. Neither the failure
      to mail any notice required by this paragraph (c), nor any defect therein
      or in the mailing thereof, to any particular holder, shall affect the
      sufficiency of the notice with respect to the other holders. Any notice
      that was mailed in the manner herein provided shall be conclusively
      presumed to have been duly given on the date when the same would be
      delivered in the ordinary course of transmission, whether or not the
      holder receives the notice. Such notice of revocation or amendment shall
      clearly state that: (1) on the Proposed Redemption Date, the Company will
      not redeem any of the Series B Preferred Shares, or if notice of partial
      revocation, the amended number of Series B Preferred Shares held by such
      holder to be redeemed, and the balance of Series B Preferred Shares held
      by such holder not being redeemed; and (2) dividends on the Series B
      Preferred Shares not being redeemed will continue to accrue on and after
      the Proposed Redemption Date without interruption.

            (d) If fewer than all outstanding Series B Preferred Shares are to
      be redeemed on any Proposed Redemption Date, the shares to be redeemed
      (which shall be a whole number) shall be selected by the Company from
      outstanding Series B Preferred Shares not previously called for redemption
      pro rata (to the extent possible without redeeming fractional shares), by
      lot or by any other method determined by the Company in its sole
      discretion to be equitable. Notwithstanding anything to the contrary in
      this Section 5, unless full cumulative dividends on the Series B Preferred
      Shares and any class or series of Parity Shares shall have been declared
      and paid or declared and set apart for payment for all past Dividend
      Periods and the then current Dividend Period (including such dividend
      periods on any Parity Shares), the Series B Preferred Shares and any
      Parity Shares may not be redeemed in part under this Section 5, and the
      Company may not otherwise purchase or acquire Series B Preferred Shares or
      any Parity Shares, otherwise than pursuant to a purchase or exchange offer
      made on the same terms to all holders of Series B Preferred Shares and
      Parity Shares.

            (e) Upon any redemption of Series B Preferred Shares pursuant to
      this Section 5, the Company shall pay all accrued and unpaid dividends, if
      any, thereon to the Redemption Date, without interest. If the Redemption
      Date falls after a dividend payment record date and prior to the
      corresponding Dividend Payment Date, then each holder of Series B
      Preferred Shares at the close of business on such dividend payment record
      date shall be entitled to the dividend payable on such shares on the
      corresponding Dividend Payment Date notwithstanding the redemption of such
      shares before such Dividend Payment Date or the Company's default in the
      payment of the dividend due. Except as provided above, the Company shall
      make no payment or allowance for unpaid dividends, whether or not in
      arrears, on Series B Preferred Shares called for redemption.

            (f) From and after the Redemption Date (unless the Company shall
      fail to make available, as hereinafter provided, an amount of cash
      necessary to effect such redemption), (i) except as otherwise provided
      herein, dividends shall cease to accrue on the Series B Preferred Shares
      being redeemed; (ii) such shares shall no longer be deemed to be
      outstanding; (iii) all rights of the holders thereof as holders of Series
      B Preferred Shares of the Company shall cease (except the right to receive
      cash payable upon such redemption, without interest thereon, upon
      surrender and endorsement of their certificates


                                      -12-


      if so required and to receive any dividends payable thereon); and (iv) any
      officer of the Company shall be entitled, on behalf of such holder and as
      its attorney-in-fact, to execute and deliver any and all documents as may
      be necessary to effect such redemption. The Company's obligation to
      provide cash in accordance with the preceding sentence shall be deemed
      fulfilled if, on or before the Redemption Date, the Company shall deposit
      with a bank or trust company (which may be an affiliate of the Company)
      that has an office in London, England, and that has, or is an affiliate of
      a bank or trust company that has, capital and surplus of at least
      $50,000,000, funds necessary for such redemption, in trust, with
      irrevocable instructions that such cash be applied to the redemption of
      the Series B Preferred Shares surrendered for redemption. No interest
      shall accrue for the benefit of the holders of Series B Preferred Shares
      to be redeemed on any cash so set aside by the Company. Subject to
      applicable escheat laws, any such cash unclaimed at the end of two years
      from the Redemption Date shall revert to the general funds of the Company,
      after which reversion the holders of such shares so called for redemption
      shall look only to the general funds of the Company for the payment of
      such cash.

            (g) On or before the Redemption Date, the holders of each Series B
      Preferred Share being redeemed shall surrender the certificate
      representing such share, duly endorsed or assigned to the Company or in
      blank, at the office of the Transfer Agent. As promptly as practicable
      after such surrender, such shares shall be exchanged for any cash (without
      interest thereon) for which such shares are being redeemed. If fewer than
      all the Series B Preferred Shares represented by any certificate are being
      redeemed, then new certificates representing the unredeemed shares shall
      be issued without cost to the holder thereof.

            Section 6. Conversion.

            (a) Unless a Special Conversion Event shall have occurred, the
      Series B Preferred Shares shall not be convertible into any other
      securities prior to the fifth anniversary of the Issue Date. At any time
      and from time to time on or after such anniversary or at any time after
      the occurrence of a Special Conversion Event, any holder of Series B
      Preferred Shares shall have the right, at its option, on the terms and
      subject to the conditions set forth in this Section 6, to cause any or all
      of such shares to be converted, as of the Proposed Conversion Date
      specified in such holder's notice to the Company given pursuant to
      paragraph (b) of this Section 6, into the number of fully paid and
      non-assessable Common Shares obtained by dividing the aggregate
      Liquidation Preference of such shares by the Conversion Price. Any
      conversion hereunder shall take the form of a redemption of the Series B
      Preferred Shares to be converted at the Conversion Price followed by the
      issue of Common Shares paid for with the proceeds of the said redemption
      applied in accordance with this Section 6. The minimum number of Series B
      Preferred Shares for which conversion may be elected shall be 10,000, or
      such lesser number which constitutes all of the outstanding Series B
      Preferred Shares held by such holder. Notwithstanding anything to the
      contrary in this paragraph (a), a holder of Series B Preferred Shares may
      provide notice of its intention to convert any or all of such shares prior
      to the fifth anniversary of the Issue Date, so long as the Proposed
      Conversion Date specified in such notice is a date after the date of such
      fifth anniversary. At any and


                                      -13-


      all times, a conversion hereunder is subject to the Company being able to
      comply with applicable provisions of Bermuda law.

            (b) In order to effect the conversion of Series B Preferred Shares,
      the holder of such shares shall provide notice to the Company not less
      than 60 Trading Days prior to the Proposed Conversion Date. Such notice
      must be provided by first-class, registered mail, postage prepaid, to the
      Company at its principal executive offices. Each such notice shall state,
      as appropriate: (1) the Proposed Conversion Date; (2) the number of Series
      B Preferred Shares (which must be a whole number of shares) to be
      converted; (3) the name or names in which such holder wishes the
      certificate or certificates for Common Shares and for any Series B
      Preferred Shares not to be so converted to be issued and the address to
      which such holder wishes delivery to be made of the new certificates to be
      issued upon conversion; (4) if applicable, a statement setting forth the
      facts and circumstances under which the holder believes that a Special
      Conversion Event has occurred; and (5) an acknowledgment that the shares
      to be converted remain subject to the Company's right of redemption in
      accordance with Section 5 hereof.

            (c) The right of any holder of Series B Preferred Shares electing to
      convert the Series B Preferred Shares pursuant to paragraph (a) of this
      Section 6 shall be fully or partially revocable, and any notice to the
      Company provided in accordance with paragraph (b) of this Section 6 shall
      be subject to revocation or amendment by the holder of the shares to which
      such notice relates. In order to effect the revocation or amendment of
      such notice, the holder shall provide notice to the Company of its
      revocation or amendment not less than three Business Days prior to the
      Proposed Conversion Date. Such notice must be given by first-class,
      registered mail, postage prepaid, to the Company at its principal
      executive offices and must clearly state that the holder of such Series B
      Preferred Shares will not convert any of such shares, or if notice of
      partial revocation, the amended number of Series B Preferred Shares held
      by such holder that are to be converted.

            (d) Notwithstanding paragraph (a) of this Section 6, no Series B
      Preferred Shares shall be converted on or after the close of business on
      any Redemption Date for which notice has been given in accordance with
      Section 5 hereof. The Company's right to redeem any or all outstanding
      Series B Preferred Shares on or prior to any Proposed Conversion Date
      shall supersede any holder's right of conversion under this Section 6,
      whether or not such holder's notice of conversion was properly delivered
      prior to the Company's notice to redeem, so long as the Company's notice
      to redeem was given in accordance with Section 5 hereof at least 30 days
      prior to the Proposed Conversion Date.

            (e) In order to consummate the conversion of Series B Preferred
      Shares, the holder of each share to be converted shall surrender the
      certificate representing such share, duly endorsed or assigned to the
      Company or in blank, at the office of the Transfer Agent, accompanied by a
      copy of the written notice of conversion previously provided to the
      Company in accordance with paragraph (b) of this Section 6, on or before
      the Conversion Date.


                                      -14-


                  (i) Unless the shares issuable on conversion are to be issued
            in the same name as the name in which such Series B Preferred Share
            is registered, each share surrendered for conversion shall be
            accompanied by instruments of transfer, in form satisfactory to the
            Company, duly executed by the holder or such holder's duly
            authorized attorney and an amount sufficient to pay any transfer or
            similar tax (or evidence reasonably satisfactory to the Company
            demonstrating that such taxes have been paid).

                  (ii) Holders of Series B Preferred Shares at the close of
            business on a dividend payment record date shall be entitled to
            receive the dividend payable on such shares on the corresponding
            Dividend Payment Date notwithstanding the conversion thereof
            following such dividend payment record date and prior to such
            Dividend Payment Date. However, Series B Preferred Shares
            surrendered for conversion during the period between the close of
            business on any dividend payment record date and the opening of
            business on the corresponding Dividend Payment Date must be
            accompanied by payment of an amount equal to the dividend payable on
            such shares on such Dividend Payment Date. A holder of Series B
            Preferred Shares on a dividend payment record date who (or whose
            transferee) tenders any such shares for conversion into Common
            Shares on the corresponding Dividend Payment Date will receive the
            dividend payable by the Company on such Series B Preferred Shares on
            such date, and the converting holder need not include payment of the
            amount of such dividend upon surrender of Series B Preferred Shares
            for conversion. Except as provided above, the Company shall make no
            payment or allowance for unpaid dividends, whether or not in
            arrears, on converted shares or for dividends on the Common Shares
            issued upon such conversion.

            (f) Each conversion shall be deemed to have been effected
      immediately prior to the close of business on the Conversion Date, and the
      Person or Persons in whose name or names any certificate or certificates
      for Common Shares shall be issuable upon such conversion shall be deemed
      to have become the holder or holders of record of the shares represented
      thereby at such time on such date, unless the Register of Members shall be
      closed on that date, in which event such Person or Persons shall be deemed
      to have become such holder or holders of record at the close of business
      on the next succeeding day on which the Register of Members is open, but
      such conversion shall be at the Conversion Price in effect on the
      Conversion Date.

            (g) As soon as practicable after the Conversion Date, provided that
      the certificate or certificates for Series B Preferred Shares shall have
      been surrendered in accordance with paragraph (e) of this Section 6:

                  (i) the Company shall issue and send by first-class mail,
            postage prepaid, to the holder thereof or to such holder's designee,
            at the address designated by such holder in the notice of conversion
            provided pursuant to paragraph (b) of this Section 6, a certificate
            or certificates for the number of full Common Shares issuable in
            accordance with paragraph (a) of this Section 6 upon the conversion
            of the number of Series B Preferred Shares specified in such notice


                                      -15-


            (excluding any fractional interest in a Common Share arising upon
            such conversion);

                  (ii) instead of issuing any fractional shares or scrip
            representing any fractional interest in a Common Share that would
            otherwise be deliverable upon the conversion of a Series B Preferred
            Share, the Company shall pay to the holder of such share an amount
            in cash based upon the Current Market Price of Common Shares on the
            Trading Day immediately preceding the Conversion Date; provided,
            however, that if more than one share shall be surrendered for
            conversion at one time by the same holder, the number of full Common
            Shares issuable upon conversion thereof shall be computed on the
            basis of the aggregate number of Series B Preferred Shares so
            surrendered; and

                  (iii) in case there shall have been surrendered a certificate
            or certificates representing Series B Preferred Shares only part of
            which are to be converted, the Company shall also issue and mail to
            such holder or such holder's designee a new certificate or
            certificates for the number of Series B Preferred Shares which shall
            not have been converted.

            (h) The Company will pay any and all documentary stamp or similar
      issue or transfer taxes payable in respect of the issue or delivery of
      Common Shares or other securities or property on conversion of the Series
      B Preferred Shares pursuant hereto; provided, however, that the Company
      shall not be required to pay any tax that may be payable in respect of any
      transfer involved in the issue or delivery of Common Shares or other
      securities or property in a name other than that of the holder of the
      Series B Preferred Shares to be converted, and no such issue or delivery
      shall be made unless and until the Person requesting such issue or
      delivery has paid to the Company the amount of any such tax or
      established, to the reasonable satisfaction of the Company, that such tax
      has been paid.

            (i) The Company covenants that it shall at all times reserve and
      keep available, free from preemptive rights, out of the aggregate of its
      authorized but unissued Common Shares, for the purpose of effecting
      conversion of the Series B Preferred Shares, the full number of Common
      Shares deliverable upon the conversion of all outstanding Series B
      Preferred Shares not theretofore converted. For purposes of this paragraph
      (i), the number of Common Shares that shall be deliverable upon the
      conversion of all outstanding Series B Preferred Shares shall be computed
      as if at the time of computation all such outstanding shares were held by
      a single holder. The Company covenants that any Common Shares issued upon
      conversion of the Series B Preferred Shares shall be legally issued, fully
      paid and non-assessable. Prior to the delivery of any Common Shares that
      the Company shall be obligated to deliver upon conversion of the Series B
      Preferred Shares, the Company shall endeavor to comply with all laws and
      regulations applicable to such conversion, including without limitation
      the approval of any applicable insurance regulatory body or agency and the
      approval of any filing or application required under applicable securities
      laws (whether of Bermuda, the United States, any state of the United
      States or any other applicable jurisdiction).


                                      -16-


            (j) If any capital reorganization or reclassification of the capital
      stock of the Company, or any amalgamation, consolidation or merger of the
      Company with one or more corporations or other entities, or the sale of
      all or substantially all of the Company's assets to one or more
      corporations or other entities, or any other transaction, shall be
      effected in such a way that holders of Common Shares shall be entitled to
      receive stock, securities or assets with respect to or in exchange for
      Common Shares, then, as a condition of such reorganization,
      reclassification, amalgamation, consolidation, merger, sale, or other
      transaction, lawful and adequate provisions (in form authorized and
      approved by the Board) shall be made whereby each holder of any Series B
      Preferred Shares shall thereafter have the right to receive, upon the
      basis and upon the terms and conditions specified herein and in lieu of
      the Common Shares immediately theretofore receivable upon the conversion
      of such Series B Preferred Shares, such shares of stock, securities or
      assets as may be issued or payable with respect to or in exchange for a
      number of Common Shares equal to the number of Common Shares immediately
      theretofore so receivable had such reorganization, reclassification,
      amalgamation, consolidation, merger, sale, or other transaction not taken
      place, and in any such case appropriate provision shall be made with
      respect to the rights and interests of such holder to the end that the
      provisions hereof shall thereafter be applicable, as nearly as may be, in
      relation to any shares of stock, securities or assets thereafter
      deliverable upon the exercise of such conversion rights.

                  (i) If applicable, the Company shall reserve as provided by
            paragraph (i) of this Section 6 such shares of common stock, other
            capital stock or other securities of the Company as may be issuable
            upon conversion of Series B Preferred Shares as provided by this
            Section 6 and shall comply with the other requirements of paragraph
            (i) of this Section 6 in respect of such shares or other securities
            so as to permit their issuance to holders of Series B Preferred
            Shares upon conversion thereof.

                  (ii) The Company covenants that it will not effect any such
            amalgamation, consolidation or merger, or any sale of all or
            substantially all of its assets or properties, unless either (A)
            prior to the consummation thereof the successor corporation or other
            entity (if other than the Company) resulting from such amalgamation,
            consolidation or merger or the corporation or other entity
            purchasing such assets shall assume, by written instrument (in form
            authorized and approved by the Board) executed and mailed or
            delivered to each holder of Series B Preferred Shares at the address
            of each such holder as shown in the Register of Members, the
            obligation to deliver to such holder such shares of stock,
            securities or assets as, in accordance with the foregoing
            provisions, such holder may be entitled to receive or (B) all of the
            outstanding Series B Preferred Shares shall have been redeemed by
            the Company pursuant to Section 5 hereof.

            Section 7. Shares To Be Retired. All Series B Preferred Shares which
      shall have been issued and reacquired in any manner by the Company,
      including without limitation by redemption in accordance with Section 5
      hereof or by conversion in accordance with Section 6 hereof, shall be
      restored to the status of authorized but unissued shares of the Company's
      stock, without designation as to class or series.


                                      -17-


            Section 8. Ranking. Any class or series of shares of the Company's
      stock shall be deemed to rank:

                  (a) prior to the Series B Preferred Shares, as to the payment
            of dividends and as to distribution of assets upon liquidation,
            dissolution or winding up, if the holders of such class or series
            shall be entitled to the receipt of dividends or of amounts
            distributable upon liquidation, dissolution or winding up, as the
            case may be, in preference or priority to the holders of Series B
            Preferred Shares;

                  (b) on a parity with the Series B Preferred Shares, as to the
            payment of dividends and as to distribution of assets upon
            liquidation, dissolution or winding up, if such class or series
            shall be Parity Shares;

                  (c) junior to the Series B Preferred Shares, as to the payment
            of dividends or as to the distribution of assets upon liquidation,
            dissolution or winding up, if such class or series shall be Junior
            Shares; and

                  (d) junior to the Series B Preferred Shares, as to the payment
            of dividends and as to the distribution of assets upon liquidation,
            dissolution or winding up, if such class or series shall be Fully
            Junior Shares.

            Section 9. Voting Rights.

            (a) Except as otherwise provided in this Section 9 and as otherwise
      required by law, holders of the Series B Preferred Shares shall have no
      voting rights; provided, however, that each holder of Series B Preferred
      Shares shall be entitled to notice of all shareholders' meetings at the
      same time and in the same manner as notice is given to the shareholders
      entitled to vote at such meetings and shall have the right to attend such
      meetings.

            (b) So long as any Series B Preferred Shares are outstanding, in
      addition to any other vote or consent of shareholders required by law or
      by the Company's Bye-Laws, as amended, the affirmative vote of the holders
      of at least 75% of the Series B Preferred Shares at the time outstanding,
      acting as a single class, given either in writing without a meeting or by
      vote in person or by proxy at any meeting called for the purpose, shall be
      necessary for effecting or validating:

                  (i) Any amendment, alteration or repeal of any of the
            provisions of the Company's Memorandum of Association, Bye-Laws or
            this Certificate of Designation that would vary the rights,
            preferences or voting powers of the holders of the Series B
            Preferred Shares;

                  (ii) An amalgamation, consolidation, merger or statutory share
            exchange that affects the Series B Preferred Shares, unless in each
            such case each Series B Preferred Share shall either (A) remain
            outstanding with no variation in its rights, preferences or voting
            powers or (B) be converted into or exchanged for


                                      -18-


            preferred shares of the surviving entity having rights, preferences
            and voting powers identical to that of a Series B Preferred Share;

                  (iii) The authorization, creation or any increase in the
            authorized amount of, any shares of any class or series or any
            security convertible into shares of any class or series ranking
            prior to the Series B Preferred Shares in the payment of dividends
            or the distribution of assets on any liquidation, dissolution or
            winding up of the Company; or

                  (iv) Any other transaction or action which would amount to a
            variation of the rights, preferences or voting powers of the holders
            of the Series B Preferred Shares;

      provided, however, that any action to authorize or create or to increase
      the authorized amount of, any Fully Junior Shares or Parity Shares shall
      not be deemed to vary the rights, preferences or voting powers of the
      holders of Series B Preferred Shares; and provided, further, that no such
      vote of the holders of Series B Preferred Shares shall be required if,
      prior to the time when any of the foregoing actions is to take effect, all
      outstanding Series B Preferred Shares shall have been redeemed.

            (c) The holders of the Series B Preferred Shares shall not be
      entitled to vote on any sale of all or substantially all of the assets of
      the Company.

            (d) For purposes of any vote by the holders of the Series B
      Preferred Shares pursuant to the foregoing provisions of this Section 9,
      each Series B Preferred Share shall have one (1) vote per share. Except as
      otherwise required by applicable law or as set forth herein, the Series B
      Preferred Shares shall not have any other voting rights or powers, and the
      consent of the holders thereof shall not be required for the taking of any
      action by the Company.

            Section 10. Transferability. The Series B Preferred Shares shall be
      freely transferable subject to the following restrictions:

                  (a) all transfers shall comply with the Company's Bye-Laws, as
            amended;

                  (b) all transfers shall comply with all applicable laws and
            regulations, including without limitation the need for the approval
            of the Bermuda Monetary Authority, the approval of any applicable
            insurance regulatory body or agency and the approval of any filing
            or application required under applicable securities laws (whether of
            Bermuda, the United States, any state of the United States or any
            other applicable jurisdiction), it being understood that with
            respect to any proposed transfer of more than one-third of the
            outstanding Series B Preferred Shares, the Company will use
            commercially reasonable efforts to cooperate with reasonable
            requests to seek to obtain any required approval of the Bermuda
            Monetary Authority or any applicable insurance regulatory body or
            agency; and


                                      -19-


                  (c) all transfers of Series B Preferred Shares during the
            first six (6) months following issuance of such Series B Preferred
            Shares (other than a transfer to an Affiliate of European
            Reinsurance Company of Zurich) shall require the prior written
            consent of the Company, which consent shall not be unreasonably
            withheld.

            Section 11. Limitation on Ownership.

            (a) Limitation. Notwithstanding any other provision of the terms of
      the Series B Preferred Shares, except as provided in Section 11(b), no
      U.S. Person shall at any time directly or indirectly acquire ownership of
      more than 9.9% of the outstanding Series B Preferred Shares. Any Series B
      Preferred Shares owned by a U.S. Person in excess of such 9.9% shall be
      deemed "Excess Preferred Shares." Within 10 days of becoming aware of the
      existence of Excess Preferred Shares (whether by notice on Schedule 13D or
      otherwise), the Company shall initiate the repurchase of any and all
      Excess Preferred Shares by giving notice of repurchase (the "Repurchase
      Notice") to the holder or holders thereof, unless, prior to the giving of
      such Repurchase Notice the holder shall have disposed of its ownership in
      the Excess Preferred Shares. The Repurchase Notice shall set forth the
      number of Series B Preferred Shares constituting Excess Preferred Shares,
      the repurchase price and the place and date of the closing at which the
      certificates representing such Excess Preferred Shares are to be
      surrendered and the repurchase price paid. The closing date shall be no
      more than 10 days after the date on which the Company mails the Repurchase
      Notice by first-class mail (such date of mailing hereinafter referred to
      as the "Repurchase Date"). The Company will be entitled to assign its
      repurchase right to a third party or parties, who may be other
      shareholders of the Company, with the consent of any such assignee(s). The
      Company may revoke the Repurchase Notice at any time before it (or its
      assignee) pays for the Series B Preferred Shares. Neither the Company nor
      its assignee(s) shall be obliged to give general notice to the Company's
      shareholders of any intention to repurchase or the conclusion of any
      repurchase of Series B Preferred Shares. The repurchase price of each
      Excess Preferred Share called for such repurchase shall be the greater of
      (x) the average Current Market Price for the Series B Preferred Shares for
      the 30 consecutive Trading Days immediately preceding the Repurchase Date
      or (y) the par value of a Series B Preferred Share. From and after the
      Repurchase Date (i) except as otherwise provided herein, dividends on the
      Series B Preferred Shares so called for repurchase shall cease to accrue;
      (ii) such shares shall no longer be deemed to be outstanding; (iii) all
      rights of the holders thereof as holders of Series B Preferred Shares of
      the Company shall cease (except the right to receive cash payable upon
      such repurchase, without interest thereon, upon surrender and endorsement
      of their certificates if so required and to receive any dividends payable
      thereon); and (iv) any officer of the Company shall be entitled, on behalf
      of such holder and as its attorney-in-fact, to execute and deliver any and
      all documents as may be necessary to effect such repurchase. Nothing in
      this Section 11(a) shall preclude the settlement of any transaction
      entered into through the facilities of the New York Stock Exchange.

            (b) Exemptions. The limitation on ownership set forth in Section
      11(a) shall not apply to the acquisition of Series B Preferred Shares by
      an underwriter in a public


                                      -20-


      offering of Series B Preferred Shares. The Board, in its sole and absolute
      discretion, may exempt from the ownership limitation set forth in Section
      11(a) certain designated Series B Preferred Shares owned by a U.S. Person
      who has provided the Board with evidence and assurances acceptable to the
      Board that ownership of such shares will cause no adverse tax, legal or
      regulatory consequences to the Company, any of the Company's Subsidiaries
      or any of the Company's shareholders.

            Section 12. Record Holders. The Company and the Transfer Agent may
      deem and treat the record holder of any Series B Preferred Shares, as the
      same appears in the Register of Members, as the true and lawful owner
      thereof for all purposes, and neither the Company nor the Transfer Agent
      shall be affected by any notice to the contrary. Payments in respect of
      Series B Preferred Shares shall be sent to the holders thereof at their
      address most recently noted on the Register of Members and, in the case of
      joint holders of Series B Preferred Shares, may be made to all such joint
      holders but sent to that one of the joint holders of Series B Preferred
      Shares who is first named in the Register of Members at his address most
      recently noted in the Register of Members or shall be made payable to such
      Person or Persons and sent to such address as all the joint holders of
      such Series B Preferred Shares may in writing direct. Cheques in payment
      of any obligation of the Company to holders of Series B Preferred Shares
      shall be sent by first-class mail at the risk of the holder of the Series
      B Preferred Shares, and due payment of a cheque shall be full satisfaction
      of the obligation represented thereby notwithstanding any notice which the
      Company may have whether express or otherwise of any right, title or
      interest or claim of any other Person to or in such Series B Preferred
      Shares.

            Section 13. Sinking Fund. The Series B Preferred Shares shall not be
      entitled to the benefits of any retirement or sinking fund.


                                      -21-


      This Certificate of Designation, Preferences and Rights of Series B
      Cumulative Convertible Perpetual Preferred Shares of Trenwick Group Ltd.,
      signed this 6th day of September, 2002.

                                        TRENWICK GROUP LTD.


                                        By:    /s/ Paul Feldsher
                                               ---------------------------------
                                        Name:  Paul Feldsher
                                        Title: Executive Vice President and
                                               Chief Underwriting Officer


                                      -22-