How did the Slavization of the Balkans take place and what consequences did it have?

From the middle of the VI century. Slavic tribes living in Central Europe east of the territory occupied by the Germans moved from raids on Byzantium to the settlement of the Balkan Peninsula. According to the Byzantine author, the Slavs “can in no way be enslaved or subjugated.” Soon, all the Balkans, except for the extreme south, were inhabited by newcomers who mingled with the local population, which began to speak Slavic.
South of the lower reaches of the Danube, the Slavs formed in the 7th century. union of seven tribes. In the 60s. VII century. these lands were invaded by the Turkic tribes of the Proto-Bulgarians, who had previously roamed the steppes of the Northern Black Sea region. The proto-Bulgarian Khan Asparukh (d. C. 701) defeated the Byzantine army, attracted an alliance of seven tribes to his side and founded an independent Slavic-Bulgarian state. The first Bulgarian kingdom existed from 681 to 1018. The Bulgarians dissolved among the Slavs, giving their name to one of the Slavic peoples.
The Slavs had a great influence on the development of Byzantium. During the settlement of the Balkans, they seized the land holdings of the magnates, in which they used the labor of slaves and dependent people. Everywhere a neighborhood community was established. The peasants became free, but they were imposed by state taxes. The Slavs, especially the southern ones (Bulgarians, Serbs, Croats, etc.), in turn, experienced a huge Byzantine influence. In 864 the Bulgarian prince Boris was baptized by Byzantium.

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