William de Percy
was born at Alnwick, Northumberland, England 1183/93.
His parents were Henry de [Sir Knight] Percy and Isabel Brus.
He married Joan de Briwere
Joan de Briwere
was born at Stoke, Devonshire, England Abt 1190
daughter of William de Briwere and Beatrice de Vaux
They were the parents of 1
born Abt 1216.
William de Percy died 1245 .