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

William was born about 1132.  William's father was William II De Percy and his mother was Adeliza De Clare.  His paternal grandparents were Baron De Percy William and Alice De Ros; his maternal grandparents were Richard fitz Gilbert de Clare and Adeliza de Meschines De Gernon. He had three brothers and four sisters, named Walter, Alan, Richard, Agnes, Maud, Alice and Emma.  He was the fourth oldest of the eight children. He had a half-brother named Richard Ap.

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