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  This provided politic, economic, and military advantages.
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  Justinian served as ruler of the Byzantine empire
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  This made Eastern Europe primarily Slavic and is the same till this day.
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  This was very important for the survival of the Byzantine empire because the Arab threat had receded
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  Rurik founded the first significant dynasty in Russian history
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  Christian missionaries started to work in Slavic lands
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  First kingdom in Czech and Slovak republics
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  The Magyar tribes settled in Hungary
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  Polish state started to emerge
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  Russia was converted to Christianity
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  The Bulgarian empire defeated the Byzantines
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  Yaroslav reigns in Kievan Rus’
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  Catholic and Eastern Orthodox Churches broke communion
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  Byzantine empire declines as the Ottomans keep attacking it
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  The fourth crusade from Westerners on Constantinople
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  Mongols capture Russia
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  Ottoman Turks take over Constantinople and the Byzantine empire ends
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  The Tatars are kicked out of Russia