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Male William III De Percy Click to view William III De Percy in the family tree

William III was born about 1138 in Alnwick, Northumberland, England.  William III's father was William De Percy and his mother is Adelize De Clare.  His paternal grandparents are William De Percy and Alice De Ros; his maternal grandfather was Richard Fitzgilbert De Clare and his maternal grandmother is Alice De Meschines. He had three brothers and five sisters, named Walter, Richard, Alan, Ada, Agnes, Maud, Alice and Emma.  He is the fifth oldest of the nine children. He has a half-sister named Richard ap.

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