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

John De was born in 1319 in Of, Rotherfield, Oxfordshire, England.1   John De's father was John De Grey and his mother was Catherine Fitzalan.  His paternal grandparents were John De Grey and Margaret Ole Oddingeseles; his maternal grandparents were Brian Fitzalan and Agnes Maud Baliol. He had a sister named Joan.  He was the older of the two children.  He died at the age of 56 on June 4th, 1375.1 

Family Details of John De's family with Maude De Burghersh

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