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Male John De Mortimer Click to view John De Mortimer in the family tree

John was born about 1234 in Wigmore, Herefordshire, England.  John's father was Ralph De Mortimer and his mother was Gwladys verch Llewelyn.  His paternal grandparents were Roger II De Mortimer and Isabel De Ferrers; his maternal grandfather was Llywelyn Fawr ap Iowerth and his maternal grandmother is Goch Tangwystyl verch Llwarch. He had three brothers and two sisters, named Hugh, Roger III, Peter, Joan and Isolde.  He is the third oldest of the six children.

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