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

Thomas was born on October 4th, 1301 in ,Gloucestershire,England.  Thomas' father was Baron Ralph de Monthermer Earl of Hertford and his mother was Joan Plantagenet Princess of England.  His maternal grandparents were Edward I, "Longshanks" Plantagenet King of England and Eleanor de Castilla. He had a sister named Mary.  He was the younger of the two children. He had a half-brother and three half-sisters, named Gilbert II, Eleanor, Margaret and Elizabeth.

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