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Female Joan de Monthermer , Nun at Amesbury Click to view Joan de Monthermer , Nun at Amesbury in the family tree

Joan's father was Ralph de Monthermer , Baron, Earl of Hertford and her mother was Joan Plantagenet of Acre.  Her maternal grandparents were "Longshanks" King of England Edward I and Princess Of Castile and Leon Eleanor. She had two brothers and a sister, named Thomas, Edward and Mary. She had a half-brother and three half-sisters, named Gilbert, Eleanor, Margaret and Elizabeth.  She died in 1299.

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