Bertha (Autun) d'Autun (abt. 775)

Quoting Cawley: "Settipani highlights the onomastic connections between the family of St Guillaume and the family of Nibelung, suggested by the names Bernard and Theoderic borne by the possible descendants of Nibelung [II][426]. He suggests that, if there was a connection between the two families, it would most likely have been through the wife of Nibelung [II] who could have been either Abba or Berta, sisters of St Guillaume. There is, however, no indication at all of the first name of the wife of Nibelung [II]. This would of course be incorrect if the connection was through either Abba's father or mother, as referred to above. The other difficulty with this hypothesis is that the Vita S. Willelmi implies that Guillaume’s sisters remained unmarried when it records that he had “duæ sorores virgines…Albana…Bertana”[427].]"