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24 ADELAIDE (or ADELA) OF Normandy, Countess of Aumale, b. abt. 1030, d. 1081/1090, sister of WILLIAM I (121-24) The Conqueror; m. (1) Enguerrad II, Count of Ponthieu, slain at the siege of Arques, 1053, son of Hugh II, d. 20 Nov. 1052, Count of Ponthieu and Bertha of Aumaile; m. (2) LAMBERT OF BOULOGNE (148-22, Count of Lens in Artois, slain at the battle of Lille, 1054; m. (3) 1054/6, EUDES (136-23), Count of Champagne and Aumale (of which he was deprived by his uncle Theobald bef. 1071), Earl of Holderness, imprissoned 1096 (CP I: 350-353, V: 736).
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Wikipedia
Born c. 1030,[1] Adelaide was an illegitimate daughter of the Norman duke Robert the Magnificent. Robert's likewise illegitimate son and successor, William the Conqueror, was Adelaide's brother or half-brother.[a]
Adelaide of Normandy (or Adeliza) (c. 1030 – bef. 1090) was the sister of William the Conqueror and was Countess of Aumale in her own right.
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Notes
The question of who her mother was remains unsettled. Elisabeth Van Houts ['Les femmes dans l'histoire du duché de Normandie', Tabularia « Études », n° 2, 2002, (10 July 2002), p. 23, n. 22] makes the argument that Robert of Torigny in the GND II, p. 272 (one of three mentions in this volume of her being William's sister) calls her in this instance William's 'uterine' sister' (soror uterina) and is of the opinion this is a mistake similar to one he made regarding Richard II, Duke of Normandy and his paternal half-brother William, Count of Eu (calling them 'uterine' brothers). Based on this she concludes Adelaide was a daughter of Duke Robert by a different concubine. Kathleen Thompson ["Being the Ducal Sister: The Role of Adelaide of Aumale", Normandy and Its Neighbors, Brepols, (2011) p. 63] cites the same passage in GND as did Elisabeth Van Houts, specifically GND II, 270-2, but gives a different opinion. She noted that Robert de Torigni stated here she was the uterine sister of Duke William "so we might perhaps conclude that she shared both mother and father with the Conqueror." But as Torigni wrote a century after Adelaide's birth and in that same sentence in the GND made a genealogical error, she concludes that the identity of Adelaide's mother remains an open question.