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

William was born in 1193 in Alwick, Northumberland, England.1   William's father was Sir Henry de Percy and his mother was Isabel de Brus.  His paternal grandparents were Count Jocelyn de Louvain and Agnes de Percy; his maternal grandparents were Baron of Skelton Adam de Brus III and Joanna le Meschines.  He was an only child.  He died at the age of 52 on July 28th, 1245 in Alwick, Northumberland, England.1 

Family Details of William's family with Joan De Briwere

Family Details of William's family with Eleanor de Baliol

1 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=michaelrneuman&id=I055611&style=TABLE
Further source/citation:
http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=jdp-fam&id=I11511&style=TABLE

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