William de Warren married Gundred, 4th daughter of William, the Conqueror, and his wife Matilda of Flanders. (It has been said that Gundred was not the daughter of William, the Conqueror, but that she was the daughter of Matilda of Flanders by, perhaps, a previous marriage. The Invincible Magazine, Vol. 1, No. 5, p. 26, says that the inseription on Gundred's tombstone describes her as wife of William de Warren and daughter of Wm., the Conqueror. Also in Burke's Dormant and Extinct Peerage, pp. 154, 568 and 588, she is called daughter by Wm., the Conqueror, in a charter signed by Wm., William de Warren and Henry I, son of William, the Conqueror. Thus proving this much discussed question. E. E. W.) For the important part that William de Warren took in the Conquest of England he received 300 lordships in the counties of Salop, Essex, Suffolk, Oxford, Hants, Cambridge, Bucks, Norfolk, Lincoln and York.
Ancestry shown differs from that shown by Cokayne in "The Complete Peerage",
and follows "Aspects of Robert of Torigny's genealogies revisted"; "Nottingham
Medieval Studies,xxxvii,1993,pp.21-27; as cited by A.B.Wilson and S.Baldwin
<abwilson@@uclink2.berkeley.edu>. The Complete Peerage vol.XIIpI,p.493-495.