Rus' Khaganate
From the 6th century onward, another group of Slavs moved from Pomerania to the northeast of the Baltic Sea, where they encountered the Varangians of the Rus' Khaganate and established the important regional center of Novgorod. The same Slavic ethnic population also settled the present-day Tver Oblast and the region of Beloozero. With the Uralic substratum, they formed the tribes of the Krivichs and of the Ilmen Slavs.