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

Joan's father was Ralph de Earl of Gloucester (styled) and her mother was Joan of Acre Plantagenet Cts de Gloucester.  Her maternal grandparents were Edward I Longshanks King of England and Eleanora de Castile Cts de Ponthieu. She had two brothers and a sister, named Thomas de Monthermer, Edward de Montthermer and Mary. She had a half-brother and three half-sisters, named Gilbert de Clare, Margaret, Eleanor and Elizabeth.  She died in 1399.

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