"But there was no law among them, and tribe rose against tribe. Discord thus ensued among them, and they began to war one against the other. They said to themselves, 'Let us seek a prince who may rule over us, and judge us according to custom'. Thus they went overseas to the Varangians, to the
Rus. These particular Varangians were known as Rus, just as some are called Swedes, and others Normans and Angles, and still others Gutes, for they were thus named. The Chuds, the Slavs, the Krivichs and the Veps then said to the Rus, 'Our land is great and rich, but there is no order in it. Come reign as princes, rule over us'. Three brothers, with their kinfolk, were selected. They brought with them all the Rus and migrated."
—The Primary Chronicle[9]
http://en.wikipedia.org/wiki/Rus%27_...mary_879-902-9