Crónica de Néstor
According to the "Primary Chronicle", Oleg of Novgorod (Helgi of Holmgard) conquered the city in 882. He was a relative of Rurik, a Varangian pagan chieftain. The date given for Oleg's conquest of the town in the "Primary Chronicle" is uncertain, and some historians, such as Omeljan Pritsak and Constantine Zuckerman, dispute this account and maintain that Khazar rule continued until as late as the 920s (documentary evidence exists to support this assertion — see the "Kyivan Letter" and the "Schechter Letter).