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Birth:          ABT 1062 of Great Waltham, Essex, England
Death:          ABT 1130 England

Notes
https://en.wikipedia.org/wiki/William_de_Mandeville
William de Mandeville (died before 1130)[1] was an Anglo-Norman baron and 
Constable of the Tower of London.
Life[edit]

William de Mandeville inherited the estates of his father Geoffrey de Mandeville, the 
Domesday tenant-in-chief, around 1100.[2] He was Constable of the Tower of London 
at that time,[3] and thus keeper of the first person known to be imprisoned there for 
political reasons, Ranulf Flambard. Flambard's escape in February 1101 would have 
significant consequences for William.[4]

It is not known if William was in some way complicit in the escape of Flambard, or was 
simply a careless keeper. Regardless, as a punishment, in 1103 Henry I confiscated 
the three richest of William's Essex estates, Sawbridgeworth, Saffron Waldon, and 
Great Waltham, comprising about a third of his entire holdings, as well as the 
constableship giving them to Eudo Dapifer, William’s father-in-law.[5][6] Little is 
known of William's activities after this.

William married Margaret, daughter of Eudo FitzHubert (Dapifer)[7] and Rohese de 
Clare. Widowed, Margaret married secondly Othuer fitz Earl (d. 1120), illegitimate son 
of Hugh d'Avranches, 1st Earl of Chester.[6][8] Their son Geoffrey de Mandeville 
would recover the seized estates and the constableship during the reign of king 
Stephen.[5]

Family[edit]
Geoffrey de Mandeville, 1st Earl of Essex (d. 1144)[4][9]
Beatrice de Mandeville (d. 19 Apr. 1197), married William de Say (d. Aug. 1144).[10] 
Their granddaughter Beatrice de Say took some of the Mandeville inheritance to her 
husband, Geoffrey fitz Peter.

Parents
DE MANDEVILLE Geoffrey (ABT 1036 - AFT 1086)
DE BALTS Adeliza (ABT 1037 - )

Siblings
DE MANDEVILLE Beatrice (ABT 1061 - )
DE MANDEVILLE William (ABT 1062 - ABT 1130)

Marriage To DE RIE Margaret (ABT 1075 - )
    m.  

Notes

Parents
DE RIE Eudo (ABT 1043 - 1120)
DE CLARE Rohese FitzRichard (1055 - 1121)

Children by DE RIE Margaret ABT 1075 - 
DE MANDEVILLE Geoffrey (ABT 1092 - 14 Sep 1144)
DE MANDEVILLE Beatrix (1105 - 19 Apr 1197)

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