who helped the rise of orthodox christianity in russia by converting to the religion
History of the Russian Orthodox Church By the mid-10th century, there was already a Christian community among Kievan nobility, under the leadership of Greek and Byzantine priests, although paganism remained the dominant religion. Princess Olga of Kiev was the first ruler of Kievan Rus to convert to Christianity, either in 945 or 957. Undoubtedly influenced by his Christian grandmother and by a proposed marriage alliance with the Byzantine imperial family, Olga's grandson Vladimir I (c. 956-1015) prince of Kiev, from among several options, chose the Byzantine rite. Baptized in 988, he led the Kievans to Christianity. This date is often considered the official birthday of the Russian Orthodox Church. Thus, in 1988, the Church celebrated its millennial anniversary.