William de Percy 1st Baron Percy
- Born: Abt 1034, Percy-en-Auge, Calvados, Lower Normandy, France
- Marriage (1): Emma de Port in 1066 in Semar, Yorkshire, England
- Died: 1097, Mount Joy, Kingdom of Jerusalem aged about 63
- Buried: Whitby Abbey, Whitby, Yorkshire, England
FamilySearch ID: LHJS-C6Q.
William married Emma de Port, daughter of Hugh de Port Lord of Basing, Sheriff of Hampshire and Nottingham- Domesday Book and Orence ou Orenge, in 1066 in Semar, Yorkshire, England. (Emma de Port was born before 1038 in Basing Manor, Basing. Hampshire, England, died in 1100 in Whitby, Yorkshire, England and was buried in 1100 in Whitby Abbey, Yorkshire, England.)
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