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

William's father was Alan de Percy and his mother was Emma de Gant.  His paternal grandparents were William Percy and Emma de Port; his maternal grandparents were Gilbert de Gant and Alice Montfort.  He was an only child.

Family Details of William's family with Alice de Tonbridge

Family Details of William's family with Sibyl de Valognes

Source/Citation
A. Rose, Kings of the North (2002)