William de Mandeville (died before 1130)George Edward Cokayne, The Complete Peerage, Vol. V (The St. Catherine Press, Ltd., London, 1926), p. 113 was an Anglo-Norman baron and Constable of the Tower of London.
Life
William de Mandeville inherited the estates of his father Geoffrey de Mandeville, the Domesday tenant-in-chief, around 1100.K.S.B. Keats-Rohan, Domesday People, I Domesday Book, (Boydell Press, 1999) p. 227 He was Constable of the Tower of London at that time,Ronald Sutherland Gower, The Tower of London, Vol. ii (George Bell & Sons, 1902), p. 179 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.J. H. Round, Geoffrey de Mandeville, (Longmans, Green, 1892), p. 37
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, Henry I confiscated the three richest of William's Essex estates, Sawbridgeworth, Saffron Walden, and Great Waltham in 1103, comprising about a third of his entire holdings, as well as the constableship giving them to Eudo Dapifer, William’s father-in-law.C. Warren Hollister, Henry I, Editor Amanda Clark Frost (Yale University Press, New Haven, London, 2003), p. 173Nicholas Vincent, 'Warin and Henry fitz Gerald, the King’s Chamberlains: The Origins of the FitzGeralds Revisited,' Anglo-Norman Studies 21 (Boydell Press, Woodbridge, 1999) pp. 223-260 Little is known of William's activities after this.
William married Margaret, daughter of Eudo FitzHubert (Dapifer) and Rohese de Clare. Widowed, Margaret married secondly Othuer fitz Earl (d. 1120), illegitimate son of Hugh d'Avranches, 1st Earl of Chester.K. S. B. Keats-Rohan, Domesday People, I Domesday Book, (Boydell Press, 1999) p. 194 William and Margaret's son Geoffrey de Mandeville would recover the seized estates and the constableship during the reign of King Stephen.
Family Geoffrey de Mandeville, 1st Earl of Essex (d. 1144)George Edward Cokayne,The Complete Peerage, Vol. V (The St. Catherine Press, Ltd., London, 1926). pp. 113-16 Beatrice de Mandeville (d. 19 Apr. 1197), married William de Say (d. Aug. 1144).George Edward Cokayne,The Complete Peerage, Vol. XI (The St. Catherine Press, Ltd., London, 1949). pp. 464-5 Their granddaughter Beatrice de Say took some of the Mandeville inheritance to her husband, Geoffrey fitz Peter.
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