Backside of the towers of the Bertradaburg in Mürlenbach, Germany
Bertrada castle in Mürlenbach, named after Bertrada of Prüm
Bertrada (b. ca. 670; d. after 721), also called Berthe or Bertree, and perhaps a Merovingian princess, is known to be the mother of Charibert of Laon, with whom she is co-founder and benefactor of the Prüm Abbey. They founded the abbey in 721.
Maurice Chaume, "Études carolingiennes I: La famille de saint Guillaume de Gellone", in _Annales de Bourgogne_, vol. I (1929), 27-56 who presents the hypothesis that she was daughter of Theuderic (Thierry).