About Berthe de Toeni
Berthe de Tosny daughter of Raoul II de Tosny (Probably) Probably not daughter of Robert III de Tosny.
Medlands about Berthe and Berenger Hespina: http://fmg.ac/Projects/MedLands/NORMAN%20NOBILITY.htm#BertheTosnyMGuyLaval
Brother and sister, and one possible additional brother, parents not known. No primary source has yet been found which identifies the parents of these [three] siblings. From a chronological point of view, they could have been the children of Raoul [II] de Tosny. It appears chronologically unlikely that they were the children of Roger [I] de Tosny [Conches]. It is possible that Robert [II] de Tosny was the same person as Robert [I] de Tosny Lord of Belvoir (see above) or Robert [III] de Tosny Lord of Stafford (see below).
BERTHE . Her marriage is confirmed by the charter dated [Sep/14 Oct] 1055 under which the monks of Marmoutier record the donations by "quemdam militem…Johannem pagi Cenomannensis indigenum, Widonis de Valle filium" of property "in Normannia, territorio Vilcassino…ecclesiam in villa…Guarniacus…juxta fluvium Eptæ" which "Wido pater eorum" accepted from "uxore sua Berta, Johannis et Haimonis matre". Her connection with the Tosny family is confirmed by the charter dated 1063 which records the consent given by "Rotbertum de Toeniaco, avunculum domni Johanni monachi nostri, filii Widonis de Valle" to the donations by the latter to Marmoutier, authorised by "Berengerius filius eius". The remaining question is the identity of her father. The date of her marriage is estimated from a charter dated 11 Nov 1039 in which her two grandsons are named (see the document MAINE for further details). If this document is correctly dated (but this is open to debate, as discussed further in MAINE), it is extremely unlikely for Berthe to have been the daughter of Roger [I] de Tosny [Conches]. m ([1010/15]) as his first wife, GUY [I] Sire de Laval, son of --- (-after 1064).