 The vast geographic distances between the tribes, scattered throughout the Norwegian coast, and the unlikeliness of a unified kingdom of such a magnitude at this early point has been cited as an argument against such a possibility.The name of the Rugii, on the other hand, matches another Middle Danubian people, who were neighbours of the Heruli, and they are thought to have migrated from the Baltic Sea.Historian Axel Kristinsson has speculated that it could have been natural for Rodulf to seek out some of his kinsmen, namely the Danubian Rugians who had joined the Ostrogoths after their kingdom was destroyed in 487.