He led a well-known campaign in A.D. 941.168

Oleg captured Kiev in the name of Rurik's son Igor in A.D. 882, the starting point of Kievan history. Whether through internal evolution, outside intervention or both, the Kievan state did arise in the Dnieper area toward the end of the 9th century.168

From 882 until about 972 or 980, Kievan princes brought the different East Slavic tribes under their sway, exploiting successfully the position of Kiev on the famous road from the Scandinavian, Baltic and Russian north of Europe to Constantinople, as well as connections with the inhabitants both of the forest and the steppe, and building up their domain into a major European state.168

Oleg, the first historical ruler of Kiev, remains an obscure figure. According to the Primary Chronicle he was a Varangian, a relative of Igor, who occupied Kiev in 882 and died in 913. Assisted by his retainers, the druzhina Oleg spread his rule from the territory of the Poliane to the areas of several neighboring East Slavic tribes. Tribute became the main form of allegiance of other tribes to Kiev. Toward the end of his life Oleg had gathered a sufficient force to undertake in 907 a successful campaign against Byzantium.In 911 Oleg obtained from Byzantium an extremely advantageous trade treaty.168

Oleg's successor, Prince Igor, ruled Kievan Russia from 913 until his death in 945. Igor had to fight the Drevliane as well as to maintain and spread Kievan authority in other East Slavic lands. That authority remained rather precarious. In 941 Igor engaged in a major campaign against Constantinople and devastated its suburbs, but his fleet suffered defeat by the Byzantine navy which used "Greek fire", an incendiary compound projected through copper pipes by Byzantine sailors to set on fire the ships of their opponents. The war was finally terminated by the treaty of 944, the provisions of which were rather less favorable to the Russians than those of the preceding agreement of 911. In 943 the Russians campaigned successfully in the distant transcaspian provinces of Persia. Igor was killed by the Drevliane in 945 while collecting tribute in their land.168

While their relations with Byzantium increased the prestige and profits of the Russians, the inhabitants of the steppe continued to threaten the young Kievan state. In addition to the Khazars, the Magyars, and the Pechenegs or Patzinaks, primitive and ferocious Turkic nomads carried out constant assaults on the Kievan state in the second half of the 10th century.168

Notes Weis' "Ancestral Roots. . ." (241:2).
"John Bailey" posted to soc.genealogy.medieval on 6 Nov 1997
Subject: Rurik Dynasty of Kiev; From Rurik to Yaroslav the Wise
"Ingvar, also called Igor, grand prince of Kiev and presumably the son of Rurik, prince of Novogorod, who is considered the founder of the dynasty that ruled Kievan Rus and Muscovy until 1598. Igor, successor to the great warrior and diplomat Oleg, assumed the throne of Kiev.
Described as a greedy, rapacious, and unsavory prince by the 12th century Russian Primary Chronicle, Igor in 913-914 led an assault into Transcaucasia that ended in defeat for his forces. He also conducted two expeditions against Byzantium (941 and 944), but many of his ships were destroyed by the "Greek fire," and the treaty that he finally concluded in 944 was less advantageous to Kiev than one obtained by Oleg in 911. Igor did manage to extend the authority of Kiev over the Pechenegs, a Turkic people inhabiting the steppes north of the Black Sea, as well as over the East Slavic tribe of Drevlyane. When he went to Dereva (the land of the Drevlyane located in the region of the Pripyat River) to collect tribute (945), however, his attempt to extort more than the customary amount provoked the Drevlyane into rebelling and killing him."