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In page Slavs:

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East Slavs have origins in early Slavic tribes who mixed and contacted with Finns, Balts[3][4] and with the remnants of the people of the Goths.[5] Their early Slavic component, Antes, mixed or absorbed Iranians, and later received influence from the Khazars and Vikings.[6] The East Slavs trace their national origins to the tribal unions of Kievan Rus' and Rus' Khaganate, beginning in the 10th century. They came particularly under the influence of the Byzantine Empire and of the Eastern Orthodox Church.[citation needed]