How did Byzantine missionaries convert the Slavs to Christianity?

Byzantine missionaries from the Orthodox Church spread their religion north to the Slavs. Two missionaries, Saint Methodius and Saint Cyril, converted many Russians to Christianity. To help themselves spread their religion they developed an alphabet for the Slavic languages called the Cyrillic alphabet. hope this helps

they were destroyed coming out of the civil war but after he war they were booming. if you need an in-depth answer follow up with me  

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answer called a epicycle;