The textbook introduces the reader to the most important events and processes of ethno-political and cultural (in a broad sense) history of the Slavic population of the Balkan Peninsula in the Middle Ages. The author consistently considers the problems of the formation of the Slavs as a separate ethno-linguistic community and the resettlement of one of its branches in the Balkans, the confrontation between the Slavs and Byzantium and the formation of independent statehood among the Balkan Slavs, their adoption of Christianity and their confessional-cultural demarcation into participants in the Byzantine and Latin cultural "circles." The final sections of the book are devoted to the problems of the Ottoman period in the history of the Slavic peoples of the Balkans, including the "deformations" of their religious and socio-cultural structure.