jan 1, 957 - Christianity is introduced in Russia by the Eastern Church

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Christianity was apparently introduced into the East Slavic state of Kievan Rus by Greek missionaries from Byzantium in the 9th century. An organized Christian community is known to have existed at Kiev as early as the first half of the 10th century, and in 957 St. Olga, the regent of Kiev, was baptized in Constantinople. This act was followed by the acceptance of Christianity as the state religion after the baptism of Olga’s grandson Vladimir I, prince of Kiev, in 988. Under Vladimir’s successors, and until 1448, the Russian church was headed by the metropolitans of Kiev (who after 1328 resided in Moscow) and formed a metropolitanate of the Byzantine patriarchate.

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