The Kievan Rus developed close ties with the Byzantines, leading early Russia to adopt Eastern Orthodox Christianity as its state religion, which had lasting cultural and religious significance. The first Russian empire revered the Roman and Byzantine empires and adopted the title of "Tsar" (derived from "Caesar"), which signified their aspiration to continue the legacy of these great empires.
The Kievan Rus developed close ties with the Byzantines, leading early Russia to adopt . The first Russian empire revered the Roman and Byzantine empires, and adopted the title of
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