| Mary DE VERNON |
| Mary DE VERNON | |
| B: | Abt 1196 |
| D: | Aft 1242 |
| 1st Baron Okehampton Robert DE COURTENAY |
| 1st Baron Okehampton Robert DE COURTENAY | |
| B: | Abt 1160 |
| Okehampton, Devonshire | |
| D: | 26 Jul 1242 |
| Iwerne, Dorset | |
| Earl of Devon William DE VERNON |
| Earl of Devon William DE VERNON | |
| B: | 1155 |
| D: | Sep 1217 |
| Baldwin DE VERNON |
| Baldwin DE VERNON | |
| D: | 04 Jun 1155 |
| Seigneur De Reviers Richard DE VERNON |
| Seigneur De Reviers Richard DE VERNON | |
| B: | Bef 1086 |
| D: | 08 Sep 1107 |
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