The Varangians (Old Norse: Væringjar; Greek: Βάραγγοι Varangoi, Βαριάγοι Variagoi) was the name given by Greeks and East Slavs to Vikings, who between the 9th and 11th centuries ruled the medieval state of Kievan Rus', settled among many rivers in Russia and formed the Byzantine Varangian Guard. According to the 12th century Kievan Primary Chronicle, a group of Varangians known as the Rus' settled in Novgorod in 862 under the leadership of Rurik. Before Rurik, the Rus' might have ruled an earlier hypothetical polity. Rurik's relative Oleg conquered Kiev in 882 and established the state of Kievan Rus', which was later ruled by Rurik's descendants.
Engaging in trade, piracy, and mercenary activities, Varangians roamed the river systems and portages of Gardariki, as the areas north of the Black Sea were known in the Norse sagas. They controlled the Volga trade route (between the Varangians and the Arabs), connecting the Baltic to the Caspian Sea, and the Dnieper and Dniester trade route (between Varangians and the Greeks) leading to the Black Sea and Constantinople. Those were the critically important trade links at that time, connecting Medieval Europe with wealthy and developed Arab Caliphates and the Byzantine Empire; Most of the silver coinage in the West came from the East via those routes.