The precise relationship, if any, between the following person and the main line of Rurik is not known

OLEG [Helgi/Haelghe] (-912). The Primary Chronicle records that Rurik bequeathed his realm to Oleg "who belonged to his kin"[43]. The Primary Chronicle describes Oleg´s capture of Smolensk, Lyubech and Kiev, where he killed the local rulers Askold and Dir and set himself up as prince[44]. The same source states that he established authority over the Polyanians, Derevlians, Severians and Radimichians, but waged war with the Ulichians and the Tivercians[45]. It also records that, after a Rus attack on Constantinople, Oleg concluded two treaties with Byzantium which established the conditions for future Russian trade with Constantinople[46]. Franklin & Shepard point out the lack of corroboration in Byzantine sources for these early treaties[47]. The Primary Chronicle records that Oleg died from a snake bite[48].

http://fmg.ac/Projects/MedLands/RUSSIA,%20Rurik.htm#_Toc198014250