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

William de Percy III was born in 1112.1   William de Percy III's father was William de Percy II Baron Percy and his mother was Alice de Ros.  His paternal grandparents were Alan (Algernon) de Percy Baron Percy and Emma de Gaunt.  He was an only child.  He died in of Topcliffe.1 

Family Details of William de Percy III's family with Alice de Clare

1 large-G675.FTW @ line 132A pp 116-117
Further sources/citations:
History of the House of Percy, Complete Peerage, Borthwick, Richard, History of the House of Percy, Complete Peerage, Borthwick, Richard

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