John De Warren 
John was born in 1231. John's father was William Plantagenet De Warren and his mother was Maud Marshall. His paternal grandparents were Hameline Plantagenet and Isabel De Warren; his maternal grandparents were William de Marshall and Isabel Fitzgilbert De Clare. He was an only child. He died at the age of 73 in 1304.
They had a son named William.
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