The early history of Siberia was greatly influenced by the sophisticated nomadic civilizations of the Scythians (Pazyryk) on the west of the Ural Mountains and Xiongnu (Noin-Ula) on the east of the Urals, both flourishing before the common era. The steppes of Siberia were occupied by a succession of nomadic peoples, including the Khitan people,[citation needed] various Turkic peoples, and the Mongol Empire. In the Late Middle Ages, Tibetan Buddhism spread into the areas south of Lake Baikal.
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