Abstract

The Brest Union marks a turning point in the history of the Kyivan Church. Since the time of Vladimir and the introduction of Christianity in at the end of X century. The Kyivan Metropolitanate was the daughter of the Church of the Constantinople Patriarchate. Formation of the Metropolitanate under the care of Byzantium - the most important institutional feature of the official entry of Kievan Rus in the Christian world. During the XI-XIII centuries. Kievan Metropolitanate gradually embraced all the eastern Slavic lands, introducing them into the church orbit of Byzantium. Hierarchically subordinated and spiritually obliged, dependent on the cultural and united in ceremonial plans, the Kievan Metropolitanate became an integral part of the wider Byzantine Orthodox world.