The FMG Medieval Lands database positions her as the daughter of Hilduin, Vicomte of Chartres, Comte de Breteuil, and his wife Emmeline.

http://fmg.ac/Projects/MedLands/CENTRAL FRANCE.htm

ADELA [Alix] de Breteuil (-11 Sep 1051). The primary source which confirms her parentage and marriage has not yet been identified. m RAOUL [II] Comte de Valois, d'Amiens et de Crépy, son of GAUTHIER [II] "le Blanc" Comte de Mantes, de Valois, d'Amiens et de Crépy & his wife Adela --- (-1060).

She is easily confused with her nieces, daughters of Erard de Breteuil, who are sisters with similar names:

ADELAIDE de Breteuil (-1073 or after). "…Gerduini vicecomitis, Ebrardi filii eius, Ebrardi filii Ebrardi, Hugonis fratris eius, Adeladis sororis eorum…" signed the charter dated to [1046/64] under which "Gelduinus…vicecomes" donated a serf to Marmoutier[466]. Nun at Marmoutiers [1039/42]/1073.

ADELAIS de Breteuil . Orderic Vitalis names Adelais, daughter of Everard du Puiset, as second wife of Roger de Montgommery and says that she was "remarkable for her gentleness and piety"[470]. m (after 1082) as his second wife, ROGER II de Montgommery Earl of Shrewsbury Baron de Bellême, son of ROGER I Seigneur de Montgommery and Vicomte de l'Hiémois & his wife Josceline --- (-Shrewsbury 27 Jul 1094, bur Shrewsbury Abbey).

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Adelaide de Breteuil

b. 980

Father Hildouin de Breteuil b. circa 960, d. 18 May 1060

    Adelaide de Breteuil was born in 980.1 She was the daughter of Hildouin de Breteuil. Adelaide de Breteuil married Raoul II de Vexin, son of Gautier II "the White", comte de Vexin, Valois, et Amiens and Adèle de Senlis, before 1025.

Family

Raoul II de Vexin b. after 974, d. 1040

Child

comte de Valois Raoul III de Valois+ b. c 1000?, d. 8 Sep 10742

Citations

[S204] Roderick W. Stuart, RfC, 268-34.

[S204] Roderick W. Stuart, RfC, 268-33.