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

John De was born about 1345 in Of, Rotherfield, Oxfordshire, England.1   John De's father was John De Grey and his mother was Maude De Burghersh.  His paternal grandparents were John De Grey and Catherine Fitzalan; his maternal grandfather was Bartholomew De Burghersh. He had four brothers and a sister, named Bartholomew De, Robert, Richard, Brian De and Maud.  He was the second oldest of the six children.1 

Family Details of John De's family with Elizabeth De Poynings

1 phelps1609.FTW
Further source/citation:
World Family Tree Vol. 16, Ed. 1 @ Tree #1609