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Female Mary de Percy Click to view Mary de Percy in the family tree

Mary was born in 1360.  Mary's father was Henry V de Percy and her mother was Mary Plantagenet of Lancaster.  Her paternal grandparents were Henry IV de Percy and Idoine de Clifford; her maternal grandparents were Henry Plantagenet of Lancaster and Maud de Chaworth. She had two brothers named Henry VI and Thomas.  She is the youngest of the three children.

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