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Son of Robert de Mortagne, Earl of Cornwall and Almodis de Mortagne, comtesse consort de Mortain Husband of Matilda de Montgomerie Brother of Aldhelm de Mortagne Half brother of Lucia de Mortagne; Agnès de Mortagne; Hertiginna av Toulouse Emma de Mortain, comtesse consort de Toulouse; William, Count of Mortain; Denise de Mortain and 2 others; Annora de Mortaigne and Robert, comte de Mortain « less
The primary source which confirms his parentage has not yet been identified.