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Male William DeMeschines Click to view William DeMeschines in the family tree

William was born about 1072 in Of, Normandy, France.1   William's father was Ranulph DeMeschines and his mother was Maud D' Avranches.  His paternal grandparents were Ranulf Count DeBayeux and Alix DeNormandy; his maternal grandparents were Richard D'Avranches and Emma DeConteville. He had three brothers named Ranulph "De Briquessart", Geoffrey and Robert.  He was the second oldest of the four children.1 

Family Details of William's family with Cecily De Rumilly

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