The High Middle Ages saw the height and decline of the Slavic state of Kievan Rus' and the emergence of Poland. Later, the Mongol invasion in the 13th century had great impact on Eastern Europe, as many countries of that region were invaded, pillaged, conquered and vassalized.
During the first half of this period (c.1025-1185) the Byzantine Empire dominated the Balkans south of the Danube, and under the Comnenian emperors there was a revival of prosperity and urbanisation; however, their domination of the region came to an end with a successful Bulgarian rebellion in 1185, and henceforth the region was divided between the Byzantines in Greece, including some parts of Macedonia and Thrace, the Bulgarians in Moesia and most of Thrace and Macedonia and the Serbians to the north-west. The Eastern and Western churches had formally split in the 11th century, and despite occasional periods of co-operation during the 12th century, in 1204 the Fourth Crusade used treachery to capture Constantinople. This severely damaged the Byzantines, and their power was ultimately usurped by the Ottoman Empire in the 15th century. The power of the Latin Empire, however, was short lived after the Crusader army was routed by the Bulgarian Emperor Kaloyan in the battle of Adrianople (1205).
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