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Female Joan de Monthermer Click to view Joan de Monthermer in the family tree

Joan was born before 1307.  Joan's father was Ralph de Monthermer and her mother was Joan of Acre Plantagenet.  Her maternal grandparents were Edward I Longshanks Plantagenet of England and Eleanor of Castile & Leon. She had two brothers and a sister, named Edward, Thomas and Mary. She had a half-brother and three half-sisters, named Gilbert, Eleanor (Alinore), Margaret and Elizabeth.

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