No near-contemporary source gives Roger's parentage. The younger Roger de Montgomery, actually son of this Roger, was instead said by chronicler Robert of Torigni to have been born to a Hugh de Montgomery by Josseline, niece of Gunnor, Duchess of Normandy. One possible interpretation of this clear misstatement is that a generation has been dropped, and that it was the elder Roger who was son of Hugh and Josseline, though others conclude that Josseline's husband was the elder Roger, the assignment of the name Hugh to her husband being the error. Though Robert de Torigni calls Josceline daughter of Wevia, sister of Gunnor, a letter from the reign of Henry I states she was daughter of another sister, Senfria.
