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There were two men of this name (give or take the final s), either of whom could have sat for one or both of the constituencies above.
One was a younger son of Sir William Fitzwilliam (d.1534), of Kempton Greys, Bedfordshire. He was connected by marriage with the 2nd Earl of Bedford, a likely parliamentary patron at Weymouth, and with the Luttrell family, lords of the borough of Minehead.
The other was of Heyshott, Sussex, an illegitimate son of William Fitzwilliam†, Earl of Southampton. He was with the Earl of Bedford in Italy in 1555 and possibly also at St. Quentin two years later. This man made his will 15 July 1576 (proved 17 Nov.), leaving most of his lands and goods to be divided between the executors, Bedford and his cousin William, son of John Fitzwilliam.
M. E. Finch, Five Northants. Fams. (Northants. Rec. Soc. xix), 102 seq.; Vis. Beds. (Harl. Soc. xix), 29; VCH Beds. iii. 300; CSP Ven. 1555-6, p. 145; HMC Foljambe, 7; PCC 37 Carew.