The Slavs were divided into two religious' groups, with most southern and eastern Slavs becoming Orthodox and most northern and western Slavs becoming Roman Catholic.
The most notable successor of the Byzantine Empire under Justinian is Slavic Europe as it is today. The Bulgarian khan Boris converted to organized Christianity in the year 865. Beginning with this, the Orthodox sphere of Christian civilization emerged and currently rules the Slav peoples east of the Balkan Range.
The Slavs in eastern Ukraine were forced to convert to Catholicism under Louis the Pious and his son, Louis the German, in the ninth century because the Holy Roman emperors saw religion and politics as being intertwined.
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