Sviatoslav I of Kiev
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.