 Recently , however , scholars such as David Christian and Constantine Zuckerman have suggested that the Schechter Letter 's account is corroborated by various other Russian chronicles , and suggests a struggle within the early Rus ' polity between factions loyal to Oleg and to the Rurikid Igor , a struggle that Oleg ultimately lost . Zuckerman posited that the early chronology of the Rus ' had to be re @-@ determined in light of these sources . Among Zuckerman 's beliefs and those of others who have analyzed these sources are that the Khazars did not lose Kiev until the early 10th century ( rather than 882 , the traditional date ) , that Igor was not Rurik 's son but rather a more distant descendant , and that Oleg did not immediately follow Rurik , but rather that there is a lost generation between the legendary Varangian lord and his documented successors . 
