William de Briouse
- Born: Abt 1049, Normandy, France
- Christened: 1052
- Marriage (1): Agnes de St. Clair in 1075 in Bramber, Sussex, England
- Died: 1093 aged about 44
- Buried: Abt 1095
FamilySearch ID: LYB8-J4W.
William married Agnes de St. Clair, daughter of Walderne de St. Clair and Helena "le Bon" de Normandie, in 1075 in Bramber, Sussex, England. (Agnes de St. Clair was born in 1054 in Saint-Clair-sur-l'Elle, Saint-Lô, Manche, Lower Normandy, France and died in 1080 in Bramber Castle, Sussex, England.)
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