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

William de Percy II's father was Alan (Algernon) de Percy Baron Percy and his mother was Emma de Gaunt.  His paternal grandparents were William de Percy I Baron Percy and Emma de Port; his maternal grandparents were Gilbert de Gaunt Lord Folkingham and Alice de Montfort-sur-Risle.  He was an only child.  He died in 1133.1 

Family Details of William de Percy II's family with Alice de Ros

1 large-G675.FTW
Further sources/citations:
History of the House of Percy, Borthwick, Richard

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