Dagobert I
Shortly after his marriage to Nanthild, a woman called Ragnetrude bore Dagobert I a son, Sigebert III (b. 630/1) later king of Austrasia. It has been speculated that Regintrud, abbess of Nonnberg Abbey, was also a child of Dagobert I, although this theory does not fit Regintrud's supposed date of birth between 660 and 665. She married into the Bavarian Agilolfing family, either Theodo of Bavaria or his son Theodbert of Bavaria.