The Byzantine Empire
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The Byzantine Empire was a powerful empire. But eventually they separated the empire into the roman christian half, and the Greek orthodox half. They celebrated the bible in different ways. The left half of the empire spoke Latin. The other half spoke Greek. The Roman Christian side fell aprt, while the Greek orthodox side prospered and learned of new trading merchandise. They took all that up into Russia and had a made effect on them. They ended up turning Christian and made the Russian Christian church. The length of the Greek orthodox empire lasted about 1000 years.