Family: John De Courtenay, Lord De Courtenay / Isabelle De Vere (F1343)
m. 1249
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 | Robert De Courtenay, Baron Of Oakhampton  (1183-1242)
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 | Mary De Reviers (1180-1242) |
| Hugh De Vere, 4th Earl Of Oxford (1184-1263) |
| Hawise De Quincy, Countess Of Oxford (1190-1263)
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| Robert De Vere, 5th Earl Of Oxford (1230-1296)  |
| John De Courtenay, Lord De Courtenay (1224-1274)
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| Isabelle De Vere (1228-1299)
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| Hugh De Courtenay (1251-1292) |