Family: Baron Nicholas Fitzmartin, of Blagdon Daetington and Cemai and Constable of Carmarthen / Baroness Isabel Fitzwilliams (F5878)
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 | Baroness Avice De Torrington (1165-1246) |
 | Ralph Fitzwilliams (1150- ) |
| Yolanda Mohun (1166- ) |
| Baroness Isabel Fitzwilliams (1200-1282) |