Sibyl deMontgomery

Sibyl's father was Roger deMontgomery and her mother was Mabel Talvas.  Her paternal grandparents were Roger deMontgomery and Josceline of Pont-Audemer; her maternal grandparents were Wm. II Talvas deAlencon and Hildeburge Mabel deBeaumont. She had a sister named Maud.

They had a daughter named Amicia (Mabel Maud) FitzHamon.