Family: Robert de Mortagne, 2nd Earl of Cornwall, Count of Mortain / Maude (Matilda) de Montgomery, Comtesse consort de Mortain (F14779)
The parent family of Guillaume (William) de Mortaigne, Comte de Mortaigne, 3rd Earl of Cornwall is the Birth Family.
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 | Agnes de Mortaigne, of Mortain (1054-1115) |
| Denise de Mortagne (1062- ) |
 | Earl Cornwall Guillaume de Mortaigne (1070-1140) |
| Miss de Mortagne (1086- ) |