Kyivan Rus, is the medieval state of Eastern Slavs. Established by the Slavic with the help of the Varangian squads whose force was used to integrate separate tribes and their lands into one powerful state. Varangian princes, who ruled Rus from its first years were gradually assimilated by natives, but the dynasty started by semy-legendary Ririk survived and continued to govern their separate principalities even after the collapse of Rus.