Oleg of Novgorod
According to the "Primary Chronicle", the Severians paid tribute to the Khazars, along with the neighboring Polans. Prince Oleg of Novgorod (reigned 879–912) conquered them and incorporated their lands into the new principality of Kievan Rus'. By the time of Yaroslav the Wise (1019–1054) the Severian peoples had lost most of their distinctness, and the areas of Severia along the upper course of the Desna River became controlled by Chernihiv.