John De Courtenay 
John's father was Robert De Courtenay and his mother was Mary Reviers. His paternal grandparents were Renaud De Courtenay and Hawise De Courcy; his maternal grandparents were William Reviers 5th Earl Devon and Mabel De Bellomont. He was an only child. He died on May 3rd, 1273.
Details of John's family with Isabel De Vere
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