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Female Fitz-William Click to view Fitz-William in the family tree

Fitz-William was born about 1186 in Of Ashington, Somerset, England.1   Fitz-William's father was Robert Fitzwilliam. She had a brother and a sister, named Reginald and Joan.  She was the youngest of the three children.  She died before 1250.1 

Family Details of Fitz-William's family with Nicholas Avenel

Family Details of Fitz-William's family with James Gerard

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