Family: Robert, Count of Mortain / Matilda de Montgomery, Comtesse de Mortain (F14780)
m. 1058
The parent family of Guillaume (William) de Mortaigne, Comte de Mortaigne, 3rd Earl of Cornwall is the Birth Family.
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 | Robert, Count of Mortain (1037-1090) |
 | Matilda de Montgomery, Comtesse de Mortain (1041-1107) |
| Agnes de Mortaigne, of Mortain (1054-1115) |
| Agnes de Mortaigne, of Mortain (1054-1115) |
| Denise Mortain (1055-1095) |
| Agnes Mortain (1056-1115) |
| Emma De Mortagne (1058-1080)  |
| William, Count of Mortain (1060-1140) |
| Denise Mortain (1060- ) |
| Denise de Mortagne (1062- ) |
| Denise de Mortagne (1062- ) |
| Earl Cornwall Guillaume de Mortaigne (1070-1140) |
| Earl Cornwall Guillaume de Mortaigne (1070-1140) |
| Miss de Mortagne (1086- ) |
| Miss de Mortagne (1086- ) |
| Eremburga of Mortain ( -1089) |