Ubba and the likes...

I googled Ubba and found several references to him in actual historical context...I pasted some below:
The Danish leaders Ingvar and. Ubba—the first whose names are given in the Anglo-Saxon annals—were, according to the sagas of the North, the sons of king Regnar Lodbrog. This prince, as these sagas, and particularly the celebrated death-song ascribed to him, inform us, had, after many victories in the countries of the Baltic, sailed to Britain, where he slew the Anglo-Saxon Waltheow, ravaged Scotland, Ireland and the smaller islands, but at length having been driven on the coast of Northumbria, was there taken prisoner by the king ^Elle, and by him put to death, by being cast into a dungeon among venomous snakes. These sagas, on which our knowledge of Scandinavian history in great measure depends, place the celebrated conqueror Regnar Lodbrog a century earlier than the period at which, according to history, the invasion of England by his sons took place, and than Mlle, in rebellion against Osbriht, the successor of ^Ethelred, had gained possession of Northumberland. The older English annals, on the other hand, make mention neither of Regnar Lodbrog, nor of any extraordinary cause of the invasion by Ingvar and Ubba2; and in Asser, a contemporary, we find of all the three names, only that of Ingvar3.