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Female Matilda Sibyl De Montgomery Click to view Matilda Sibyl De Montgomery in the family tree

Matilda Sibyl was born about 1066 in Of, St Germain Mntgm, Normandy, France.1   Matilda Sibyl's father was Roger De Montgomery and her mother was Mabel Talvas.  Her maternal grandfather was William Talvas.  She was an only child.1 

Family Details of Matilda Sibyl's family with Robert Fitzhamon

1 phelps1609.FTW
Further sources/citations:
World Family Tree Vol. 9, Ed. 1 @ Tree #2571, basel.FTW