William de Mandeville 
William de was born about 1058 in Manneville, Seine-Inferieure, Normandy, France. He died about 1130 in Great Waltham, Essex, England.General Notes
William de Magnivil, corrupted into Mandeville, was keeper of the Tower of London. He m. Margaret, only dau. and heiress of Eudo de Rie Dapifer,* and had issue, Geoffrey and Beatrix. He was s. at his decease by his son, Geoffrey.
* Dapifer, id est, Steward, to King William for Normandy
[Sir Bernard Burke, Dormant, Abeyant, Forfeited and Extinct Peerages, Burke's Peerage, Ltd., London, England, 1883, p. 352, Mandeville, Earls of Essex]
‌William de and Margaret de were married in a religious ceremony about 1083 in England. They had a son and a daughter, named Geoffrey de and Beatrice de.
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Children
Geoffrey de Mandeville , 1st Earl of Essex
Geoffrey de was born in 1092 in Great Waltham, Essex, England. He died at the age of 52 on September 14th, 1144 in Mildenhall, Suffolk, England.
Beatrice de Mandeville
Beatrice de was born in 1105 in Manneville, Seine-Inferieure, Normandy, France. She died before April 19th, 1197 in Rickling, Essex, England. She was buried in Walden Abbey, Hertfordshire, England.
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