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

William was born about 1047 in Of, Neubourg, Manche, France.1   William's father was Roger De Beaumont and his mother was Adeliza Meulent.  His paternal grandparents were Humphrey DeHarcourt and Aubreye De La Haie; his maternal grandparents were Waleran Beaumont Count Of Meulan and Oda DeConteville. He had two brothers and a sister, named Robert, Henry and Aubreye.  He was the second youngest of the four children.1 

1 phelps1609.FTW
Further source/citation:
World Family Tree Vol. 16, Ed. 1 @ Tree #1609