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Male Thomas de Monthermer Click to view Thomas de Monthermer in the family tree Click to view Thomas de Monthermer in the family tree

Thomas' father was Ralph de Monthermer and his mother was Joan Plantagenet of Acre.  His maternal grandparents were King Edward I ("Longshanks") of England and Eleanor Ponthieu of Castile and Leon. He had three half-sisters named Eleanor, Margaret and Elizabeth.

Family Details of Thomas' family with Margaret Tiptoft