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Female Mary De Monthermer Click to view Mary De Monthermer in the family tree

Mary was born in 1301.  Mary's father was Ralph De Monthermer and her mother was Joan Plantagenet.  Her paternal grandfather was De Meisnilhermer; her maternal grandparents were Edward I 'Longshanks' and Lady Eleanor of Castile. She had a brother named Thomas.  She was the older of the two children. She had a half-brother and three half-sisters, named Gilbert, Lady Margaret, Alianor (Eleanor) and Elizabeth.

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