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Male William Click to view William in the family tree

William was born on October 14th, 1024 in Falaise, Calvados, France.1   William's father was Robert and his mother was Herleve Unknown.  His paternal grandparents were Richard and Judith Of Brittany; his maternal grandfather was Fulbert Of Falaise. He had a half-sister named Adelaide "Countess Of.  He died at the age of 62 on September 10th, 1087 in Hermentruvilleby, Rouen, Seine-Maritime, France.1 

Family Details of William's family with Matilda

1 phelps1609.FTW
Further sources/citations:
World Family Tree Vol. 4, Ed. 1 @ Tree #0574, 0574.ftw, phelps.FTW @ Tree #1353, World Family Tree Vol. 16, Ed. 1 @ Tree #1609