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

William was born in 1138 in Alnwick, Northumberland, England.1   William's father was 4th Baron de Percy William de Percy II and his mother was Alice de Clare.  His paternal grandparents were William de Percy and Alice de Ros; his maternal grandparents were Lord Richard Fitzgilbert de Clare and Adeliza de Meschines. He had three brothers and five sisters, named Walter, Richard, Alan, Ada, Agnes, Maud, Alice and Emma.  He was the fifth oldest of the nine children.

1 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=clcaldwell&id=I012153

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