Campaigns of Oleg I
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Were a series of expansionistic military campaigns by Oleg, ruler of the Kievan Rus'.
Chronology
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January 886: In 885, Oleg of Novgorod, subjugated the Poliane people, a Slavic tribe.
January 886: The territories of the Vyatichi fall under control of the Kievian Rus'.
January 886: Territory of the Radimichs (an East Slavic tribe) conquered by Kievan Rus'.
January 880: According to Rus' Primary Chronicle, the first ruler to start uniting East Slavic lands into what has become known as Kievan Rus' was Prince Oleg (879-912).
January 882: In 880-82, Oleg of Novgorod led a military force south along the Dnieper river, capturing Smolensk and Lyubech before reaching Kiev. There, he deposed and killed Askold and Dir, proclaiming himself prince of Kievan Rus'.
January 883: Oleg set about consolidating his power over the surrounding region and the riverways north to Novgorod, imposing tribute on the East Slav tribes.
January 883: Expansion of the Kievan Rus' by 883 AD.
January 884: In 883, Oleg of Novgorod, prince of the Kievan Rus', conquered the Drevlians, a Slavic tribe.
January 886: The Severians were a tribe or tribal confederation of early East Slavs occupying areas to the east of the middle Dnieper River and southeast of the Danube River. Oleg of Novgorod annexed their territory to the Kievan Rus'.
Selected Sources
Атлас. 6 класс. История России с древнейших времен до XVI века (Atlas. 6th grade. History of Russia from ancient times to the 16th century.) , Дрофа Publisher (2015), Moscow (Russia), p. 5-8