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

William was born in 1332 in Alnwick, Northumberland, England.  William's father was Henry III De Percy and his mother was Idonea De Clifford.  His paternal grandparents were Henry II De Percy and Eleanor FitzAlan; his maternal grandparents were Robert I De Clifford and Maud De Clare. He had four brothers and four sisters, named Henry V, Richard, Roger, Thomas, Margaret, Isabel, Maud and Eleanor.  He is the third youngest of the nine children.

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