Baron Robert Martin, I of Dartington Athelhampton
1235 - 1285 (50 years)
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Baron Robert Martin, I of Dartington Athelhampton |
| 1235 - 1285 (50 years) |
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Baroness Isabel Fitzwilliams |
 1200 - 1282 (82 years) |
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Baron Nicholas Fitzmartin, of Blagdon Daetington and Cemai and Constable of Carmarthen |
| 1193 - 1282 (89 years) |
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Yolanda Mohun |
| 1166 - |
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Ralph Fitzwilliams |
| 1150 - |
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