William III de Saye, Governor of Rochester Castle, Lord of West Greenwich

Do not confuse with his cousin, William de Say, son of William de Say and Aufrica.

http://fmg.ac/Projects/MedLands/ENGLISHNOBILITYMEDIEVAL3P-S.htm

WILLIAM de Say . "Upon the death of Geoffrey de Say…William de Say his son and heir" paid homage to the king "for all that Geoffrey held of the king in chief" [in Bedfordshire], dated [Sep] 1230

Children

1. (Miss) de Say+1,6,3,4. Married John Sudeley.
2. Agnes de Say+7,8,1,9,3 b. c 1250. Married Alexander de Cheyne.
3. Hawise de Say+1,2,3 b. c 1253, d. a 1318. Married John Marshall.
4. Sir William de Say+1,3 b. 20 Nov 1253, d. b 16 Sep 1295. Married Elizabeth.

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References

1. http://www.genealogics.org/getperson.php?personID=I00139394&tree=LEO cites
   1. [S00058] The Complete Peerage, 1936 , Doubleday, H.A. & Lord Howard de Walden. XI 470
   2. [S00892] Magna Charta Sureties, 1215 4th & 5th edition , Weis, Frederick Lewis. page 17
   3. [S00010] A Genealogical History of the dormant, abeyant, forfeited and extinct peerages of the British Empire, London, 1866, Burke, Sir Bernard. 476