Genealogy of the Bryan and Martin Families
Family: John Courtenay, Baron Okehampton / Isabelle de Vere (F1793)
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Robert Courtenay, Baron Okehampton ( -1242)
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Mary de Vernon ( -1245) |
| Hugh de Vere, 4th Earl of Oxford (1208-1263)
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| Hawise de Quincy (1210- )
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Robert de Vere, 5th Earl of Oxford (1250- )  |
| Isabelle de Vere ( -1275)
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| John Courtenay, Baron Okehampton ( -1274)
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| Hugh Courtenay, Baron Okehampton ( -1292) |