Kievan Rus'
Kievan Rus', also known as Kyivan Rus', was the first East Slavic state and later an amalgam of principalities in Eastern Europe from the late 9th to the mid-13th century. Encompassing a variety of polities and peoples, including East Slavic, Norse, and Finnic, it was ruled by the Rurik dynasty, founded by the Varangian prince Rurik. The name was coined by Russian historians in the 19th century to describe the period when Kiev was at the center. At its greatest extent in the mid-11th century, Kievan Rus' stretched from the White Sea in the north to the Black Sea in the south and from the headwaters of the Vistula in the west to the Taman Peninsula in the east, uniting the East Slavic tribes.
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For other historical states known as Rus', see Rus.

Kievan Rus',[lower-alpha 1][lower-alpha 2] also known as Kyivan Rus',[lower-alpha 3][8] was the first East Slavic state and later an amalgam of principalities in Eastern Europe from the late 9th to the mid-13th century.[11][12] Encompassing a variety of polities and peoples, including East Slavic, Norse,[13][14] and Finnic, it was ruled by the Rurik dynasty, founded by the Varangian prince Rurik.[15] The name was coined by Russian historians in the 19th century to describe the period when Kiev was at the center. At its greatest extent in the mid-11th century, Kievan Rus' stretched from the White Sea in the north to the Black Sea in the south and from the headwaters of the Vistula in the west to the Taman Peninsula in the east,[16][17] uniting the East Slavic tribes.[12]

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According to the Primary Chronicle, the first ruler to unite East Slavic lands into what would become Kievan Rus' was Oleg the Wise (r. 879–912). He extended his control from Novgorod south along the Dnieper river valley to protect trade from Khazar incursions from the east,[12] and took control of the city. Sviatoslav I (r. 943–972) achieved the first major territorial expansion of the state, fighting a war of conquest against the Khazars. Vladimir the Great (r. 980–1015) spread Christianity with his own baptism and, by decree, extended it to all inhabitants of Kiev and beyond. Kievan Rus' reached its greatest extent under Yaroslav the Wise (r. 1019–1054); his sons assembled and issued its first written legal code, the Russkaya Pravda, shortly after his death.