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The majority of Crimean population adheres to the Russian Orthodox Church, with the Crimean Tatars forming a Sunni Muslim minority, besides smaller Roman Catholic, Ukrainian Greek Catholic, Armenian Apostolic and Jewish minorities.
The Crimean peninsula was Christianised at an early time, via Gothic Christianity, in the 4th century. According to a 9th-century tradition, Pope Clement I (ruled 88–98) was exiled to Chersonesos (near what is now Sevastopol) in 102, as was Pope Martin I in 655. A representative from the Black Sea area, the "head of the Scythian bishopric", was present at the First Council of Nicaea in 325, as well as the First Council of Constantinople in 381; it has been surmised that this representative would have to have been Bishop Cadmus of the Bosporan Kingdom. Ostrogoths, who remained on present-day Ukrainian lands after the invasion of the Huns, established a metropolinate under the Bishop of Constantinople at Dorus in northern Crimea around the year 400. The Goths initially adhered to Arianism, but by the 9th century, with the establishment of the Byzantine Cherson theme, the Goths in Crimea turned to the Greek Orthodox Church, under the Metropolitanate of Gothia. A bishop's seat had also existed since 868 across the Strait of Kerch, in the city of Tmutarakan. In the mid-10th century, the eastern area of Crimea was conquered by Prince Sviatoslav I of Kiev and became part of the Kievan Rus' principality of Tmutarakan. In 988, Prince Vladimir I of Kiev also captured Chersonesos where he later converted to Christianity.
Meanwhile, the Khazars, who occupied the northern parts of the peninsula, converted to Judaism. Both the date of the conversion, and the extent of its influence beyond the elite, are disputed; the conversion must have taken place at some point between AD 740 and 920.
Islam in Crimea begins with the presence of Islamized Turco-Mongol populations following the Mongol invasion of Rus' in the 1230s. Islam becomes the state religion of the Golden Horde in 1313 with the conversion of Öz Beg Khan (Crimea's first mosque was built in Qırım in 1314).
With the annexation by Russia in 1779, Crimea was again Christianised, this time under the Russian Orthodox Church, but most Crimean Tatars remain Muslim to the current day.