The Danish scholar Tor Karsten has pointed out that the territory of present-day Uppland, Södermanland and East Gothland in ancient times was known as Roðer or roðin.
O estudoso danés T. E. Karsten sinalou que o territorio que agora ocupan as zonas de Uppland, Sodermanland e o leste da illa de Gotland en tempos antigos eran coñecidos como Rođer ou Rođin.