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Male William De Percy Click to view William De Percy in the family tree

William was born in 1224 in Alnwick, Northumberland, England.  William's father was William De Percy and his mother is Eleanor De Baliol.  His paternal grandparents were Henry De Percy and Isabel De Brus; his maternal grandparents are Ingelram De Baliol and Agnes Berkeley. He had six brothers named Ingelram, Alan, Walter, Josceline, Geoffrey and Henry I.  He is the fourth oldest of the seven children. He had a half-sister named Anastasia.

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