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In the 8th and 9th.centuries, Kyivan Rus expanded and developed, and-later became one of the largest and mightiest of medieval powers. It was populated by the Slavic tribes of Polyans, Drevlyans, Siverians, Dulibs, White Croats, Tyvertsi and Ulyches. It occupied a vast temritory- from the Baltic Sea to the Black Sea and from te Carpathian Mountains to the Volga River.In 882, Prince Oleh the Seer defeated the Kyiv Princes Askold and Dir and brought the Slavic tribes of Eastem Europe together. he is recorded as saying, "Let Kyiv be the Mother of Rus cities.In 913, after Prince Oleh the Seer's death, Ihor the Elder and his wife Princess Olha joined the Drevlyans' land (the north of today's Ukraine) to Kyivan Rus. It was done at the expense of Prince Ihor's life. As revenge, Princess Olha burnt the town of Iskorosten to ashes.In 988, Prince Volodymyr introduced Christianity as the official state religion in Kyivan Rus and ordered the destruction of all pagan idols.In the 11 century, under the rule of Prince Yaroslav the Wise, Kyivan Rus became a major factor in European obtics. In the 12 century, feudal conflicts split Kyivan Rus into fifteen principalities and lands.In 1240, Tatar-Mongols captured Kyiv and kept it under control for almost three centuries