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

William de Percy IV was born in Alnwick, Northumberland.1   William de Percy IV's father was Henry de Percy Lord Percy and his mother was Isabel de Brus.  His paternal grandparents were Joscelin de Percy Lord Percy and Agnes de Percy Bss Percy; his maternal grandparents were Adam de Brus III Lord Skelton and Juette de Arches.  He was an only child.  He died about July 28th, 1245.1 

Family Details of William de Percy IV's family with Eleana de Baliol

Family Details of William de Percy IV's family with Joan de Briwere

1 SUSANNA KEENE.FTW
Further sources/citations:
Complete Peerage, Location: Mid-Continent Library, Independence, Reitwiesner, William Addams, Recipient: usenet newsgroup, Ancestry of Richard Plantagenet & Cecily de Neville @ chart 1060, no title, Borthwick, Richard, Recipient: soc.genealogy.medieval, Address:, Lewis, Marlyn, Recipient: J.H. Garner, soc.genealogy.medieval, @ no parents, no title

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