Exhibit 99.1


                               Certification

The undersigned officer of ACE Limited (the "Corporation") hereby certifies
that the Corporation's Quarterly Report on Form 10-Q for the quarter ended
June 30,2002, fully complies with the applicable reporting requirements of
Section 13(a) of the Securities Exchange Act of 1934 (15 U.S.C. 78m(a)) and
that the information contained in the Form 10-Q fairly presents, in all
material respects, the financial condition and results of operations of ACE
Limited.




Dated:  August 13, 2002                       /s/  Brian Duperreault
                                              -------------------------------
                                              Brian Duperreault
                                              Chairman and
                                              Chief Executive Officer