It is not certain Adeliza and Agatha were distinct daughters, but if they were, William of Jumièges likely confused them. None of the daughters’ ages is known according to Orderic Vitalis. See Douglas 1964, p. 395; Ordericus Vitalis 1854, pp. 181–182, n. 1. Douglas, David C. (1964). William The Conqueror. Berkeley; Los Angeles: University of California Press.
Gathagan 1999. Gathagan, Laura L. (1999). "The Trappings of Power: the Coronation of Mathilda of Flanders". The Haskins Society Journal. 13: 19–39. ISSN0963-4959.
Gathagan 2020, p. 90. Gathagan, Laura L. (2020). "Audi Israel: Apostolic authority and the Coronation of Mathilda of Flanders". In S.D. Church (ed.). Anglo-Normans Studies XLIII: Proceedings of the Battle Conference 2020. pp. 89–103. ISSN0954-9927.
Gathagan 1999, p. 37. Gathagan, Laura L. (1999). "The Trappings of Power: the Coronation of Mathilda of Flanders". The Haskins Society Journal. 13: 19–39. ISSN0963-4959.
Gathagan 2017, p. 841. Gathagan, Laura L. (2017). "'You Conquer Countless Enemies even as a Maiden': the Conqueror's Daughter and Dynastic Rule at Holy Trinity, Caen". History: The Journal of the Historical Association: 37–63. ISSN0018-2648.