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

William was born about 1065 in Of, Sussex, England.1   William's father was William De Warren and his mother was Gundred Princess Of England.  His paternal grandparents were Ralph De Warren and Emma Mrs De Warenne; his maternal grandparents were William and Matilda. He had a brother and two sisters, named Reginald De, Edith De and Gundred De.  He was the oldest of the four children.  He died on May 11th, 1138 in England.1 

Family Details of William's family with Isabel DeVermandois

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