Robert married Alberada, who is believed to be the illegitimate daughter of Hugh d'Ivry, Bishop of Bayeux. (See her profile.)
Concerning the proposal that Robert and Albereda were parents to the butlers Hugh and Roger d'Ivry, see Stapleton p. 32.
Sources
Chibnall, Marjorie. The Ecclesiastical History of Orderic Vitalis, Vol. IV, p. 199, footnote 4.
Judith A. Green (2000) "Robert Curthose Reassessed", Anglo-Norman Studies XXII: Proceedings of the Battle Conference 1999 xxii, 95–116 https://books.google.be/books?id=yRkiwGIvQqIC
Cockayne et al., Complete Peerage, 2nd ed., vol. 8, pp. 208ff.
Jean Mesqui, Les seigneurs d'Ivry, Bréval et Anet aux XIe et XIIe siècles : châteaux et familles à la frontière normande, Caen : Société des antiquaires de Normandie, 2011. Available on academia.edu https://www.academia.edu/38962435
Cawley, Charles. Medieval Lands: A prosopography of medieval European noble and royal families. Hosted online by the Foundation for Medieval Genealogy (FMG), accessed 2021, Seigneurs d'Ivry.
Europäische Stammtafeln, ES III, 694A.
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