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

William De was born about 1251 in Bernard Castle, Gainford, Durham, England.1   William De's father was John De Baliol and his mother was Dervorgilla De Galloway.  His paternal grandparents were Hugh De Baliol and Cecily De La Fontaine; his maternal grandparents were Alan De Galloway and Margaret Huntingdon. He had four brothers and five sisters, named Hugh De, Alexander De, John, Alan De, Cecilia De, Eleanor De, Mary De, Ada De and Margaret De.  He was the second youngest of the ten children.1 

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