The Orthodox Church had its greatest missionary success with the

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The Orthodox Church had its greatest missionary success with the Russians, who adopted Eastern Orthodoxy as their state religion in the late 10th century under the rule of Vladimir the Great. The Orthodox Church played a significant role in shaping Russian society and culture, and its influence spread to other Slavic countries as well. While the Orthodox Church did have some success in converting other groups such as the Mongols, their impact was not as significant as with the Russians.

The Orthodox Church Had Its Greatest Missionary Success with the