William de Mandeville
- Born: 3 Dec 1062, Rycote, Oxfordshire, England
- Marriage (1): Marguerite de Rie
- Died: 6 Jan 1130, Great Waltham, Essex, England aged 67
- Buried: After 6 Jan 1130, Mortemer Abbey, Seine-Maritime, Haute-Normandie, France
FamilySearch ID: KX2S-NX6.
William married Marguerite de Rie, daughter of Sir Eudes de Rie and Rohese de Clare. (Marguerite de Rie was born on 24 Jan 1075 in Colchester, Essex, England, died on 13 Nov 1119 in Rickling, Essex, England and was buried on 13 Nov 1119 in Oxfordshire, England.)
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