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Birth:          ABT 1106 Sawbridgeworth, Hertfordshire, England
Death:          AFT Aug 1144 outside Burwell Castle, Cambridgeshire, England
Cause of Death: killed attacking castle

Notes
adjust bdate from 1125 to match spouse and children
https://en.wikipedia.org/wiki/William_de_Mandeville
http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=jweber&id=I01915
It has been suggested that the family derived its name from Sai, about two miles SE of 
Argentin in Normandy, though there is no substantial evidence for this. Certainly 
William de Say, possibly a Norman, married by 1098 Agnes, daughter of Hugh de 
Grentmesnil.

But the known pedigree originates with another William de Say, granted his (probably 
dead) father's lands in a charter of the Empress Maud between Christmas 1141 and 
June 1142; joined his brother-in-law Geoffrey de Mandeville, 1st Earl of Essex of the 
1140 creation, in rebellion against Stephen 1144; married Beatrice (died 19 April 1197 
or some year before it), daughter of William de Mandeville, sister of 1st Earl of Essex 
and divorced wife of Hugh Talebot, and was allegedly killed in an attack on Burwell 
Castle, Cambs, along with his brother-in-law, 1st Earl of Essex Aug 1144, though he 
may well have died later. [Burke's Peerage]

Note: Magna Charta Sureties has Geoffrey de Mandeville dead 14 Sep 1144. Also 
note that I have this William as a grandson of William de Say & Agnes de Grentmesnil.

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William de Say I is chiefly known as an associate of Geoffrey de Mandeville, 1st Earl 
of Essex, in his last revolt, with Hugh Bigod, against Stephen in 1144. In the 2nd 
charter of the Empress Maud to the Earl, issued between Christmas 1141 and the end 
of June 1142, William was given a special grant of his father's lands. According to 
Henry of Huntingdon, he was killed with the Earl in Aug. 1144 when, after occupying 
Ramsey Abbey, they were attacking Stephen's fort at Burwell, Cambs. but there is 
evidence that William surv. the Earl (f). He m. Beatrice, divorced wife of Hugh 
Talebot, sister of Earl Geoffrey above named, and da. of William de Mandeville. The 
Earl is said to have brought her to England for the marriage. She lived to a great age; 
d. 19 Apr, in or before 1197, and was buried at Walden Abbey. (Complete Peerage 
XI:464-5 (transcribed by Thomas Aiken))

(f) The Earl himself did no die until Sep. Dr. G Herbert Fowler, in a paper on the 
Beauchamps, Barons of Eaton, cited a confirmation to St. Neot's Priory by William de 
Say and Beatrice his wife and William his heir for the soul of Earl Geoffrey de 
Mandeville of a grant of land in Eaton Socon, Beds. The original grant was made for 
the soul of the same Earl by Hugh de Beauchamp, who, Dr. Fowler says, was William's 
man in respect of the land. Eaton Socon had been restored to the Earl in 1142 by the 
Empress Maud, and such interest as William possessed must have been in right of his 
wife. The "Libellus de Anniversariis of Ramsey Abbey" says that William de Say d. 11 
Jan without giving the year. This refers to William de Say I because William II d. about 
Aug in 1177.

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William de Say, son of William de Say, and grandson of William de Say, who came into 
England with the Conqueror. He m. Beatrix, the divorced wife of Hugh Talbot, and 
dau. of Geoffrey de Mandeville, Earl of Essex, sister of Godfrey, and aunt, and 
eventually heiress of William de Mandeville, Earls of Essex, by whom he had issue, 
William and Geoffrey. [Sir Bernard Burke, Dormant, Abeyant, Forfeited, and Extinct 
Peerages, Burke's Peerage, Ltd., London, 1883, p. 476, Saye, or Say, Barons Saye]

Parents
DE SAY Geoffrey (ABT 1088 - )
DE CLARE Hawise (ABT 1089 - )

Siblings
DE SAY William (ABT 1106 - AFT Aug 1144)

Marriage To DE MANDEVILLE Beatrix (1105 - 19 Apr 1197)
    m.  

Notes

Parents
DE MANDEVILLE William (ABT 1062 - ABT 1130)
DE RIE Margaret (ABT 1075 - )

Children by DE MANDEVILLE Beatrix 1105 - 19 Apr 1197
DE SAYE William (ABT 1133 - BEF 1 Aug 1177)

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