Danish Viking armies in the Frankish kingdoms suffered a series of defeats in the late 9th century, culminating with the Battle of Leuven (891).
[1] In the last-mentioned confrontation the Vikings, according to the Annales Fuldenses were killed or drowned in the hundreds or thousands, and the Danish kings Sigfred and Gudfred were among the slain.
[2] According to the ecclesiastic chronicle of Adam of Bremen (c. 1075), a certain king Helge ruled in Denmark after the defeat of the Norsemen.
[3] High medieval Norse tradition took up elements of Adam's account and blended them with Scandinavian saga characters.
"[4] Since Sigurd's son Hardeknud I was still young, Helge stayed with Aslaug and acted as protector-ruler in Denmark, thus performing the same role as the legendary hero Beowulf in the Geatic court.