Fisker 10-K 2007 FY Annual report

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Section 1350 Certification

In connection with the Annual Report of Flagstone Reinsurance Holdings Limited (the “Company”) on Form 10-K for the year ended December 31, 2007, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, James O’Shaughnessy, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted by § 906 of the Sarbanes-Oxley Act of 2002, that, based on my knowledge:

(1)  The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)  The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

Date:  March 19, 2008

/s/ James O’Shaughnessy

James O’Shaughnessy

Chief Financial Officer