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The earliest tribal centres of the East Slavs included Novgorod, Izborsk, Polotsk, Gnezdovo, and Kiev. Archaeology indicates that they appeared at the turn of the tenth century, soon after the Slavs and Finns of Novgorod had rebelled against the Norse and forced them to withdraw to Scandinavia. The reign of Oleg of Novgorod in the early tenth century witnessed the return of the Varangians to Novgorod and the relocation of their capital to Kiev on the Dnieper. From this base, the mixed Varangian-Slavic population (known as the Rus) launched several expeditions against Constantinople.