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

William was born after 1140.  William's father was William III de Percy and his mother was Sibyl de Valognes.  His paternal grandparents were Alan (Algernon) de Percy and Emma de Gaunt. He had a brother and two sisters, named Walter, Alice and Emma. He had two half-brothers and three half-sisters, named Alan, Everard, Agnes, Maud and Helwise.

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