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

William de was born about 1231 in ,Petworth,Sussex,England.1   William de's father was Sir. William de Percy Baron and his mother was Eleanor de Balliol.  His paternal grandparents were Henry I de Percy Sheriff of Northumberland and Isabel Brus; his maternal grandparents were Ingelram (Ingram) (Balliol) De Baliol and Agnes de Berkeley. He had seven brothers named Ingelram de, Walter de, Henry De, Josceline de, Geffrey de, Richard de and Alan de.  He was the second oldest of the eight children. He had five half-sisters named Anastace, Joane de, Alice de, Agnes de and Ada de.

1 "Genealogical Research of Kirk Larson"
Further sources/citations:
"FamilySearch® Ancestral File™ v4.19", "Complete baronetage: Microprint ed." @ 3:269

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