1st Baron De Percy William 
1st Baron De Percy was born in 1034 in Normandy, France. 1st Baron De Percy's father was Sire de Percy Geoffrey. His paternal grandfather was William De Percy. He was an only child. He died at the age of 63 in 1097 in Mountjoy, near Jerusalem.General Notes
Said to have accompanied Hugh d'Avranches, later Earl of Chester, from
Normandy to England. See The Complete Peerage vol.X,p436.
They had a son and a daughter, named Baron De Percy and Emma.
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