Bulgarian Empire

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Bulgarian Empire (Bulgarian: Българско царство, Balgarsko tsarstvo ['bɤl.gər.sku 'ʦar.stvu]) is a term used to describe two periods in the medieval history of Bulgaria, during which it acted as a key regional power in Europe in general and in Southeastern Europe in particular, often rivalling Byzantium. The two "Bulgarian Empires" are not treated as separate entities, but rather as one state restored after a period of Byzantine rule over its territory.

The First Bulgarian Empire was established as a result of an expansion of Old Great Bulgaria to the territory south of Danube River, and is usually described as having lasted between 681 (when its existence was acknowledged by Byzantium by means of a peace treaty) and 1018, when it was subjugated by the Byzantine Empire. It gradually reached its cultural and territorial apogee in the 9th century and early 10th century under Boris I and Simeon the Great, when it developed into the cultural and literary centre of Slavic Europe, as well as one of the largest states in Europe.

The medieval Bulgarian state was restored as the Second Bulgarian Empire after a successful uprising of two nobles from Tarnovo, Asen and Peter, in 1185, and existed until it was conquered during the Ottoman invasion of the Balkans in the late 14th century, with the date of its subjugation usually given as 1396. (The last Bulgarian territory to fall under Ottoman domination was Sozopol, in 1453.) Under Ivan Asen II in the first half of the 13th century it gradually recovered much of its former power, though this did not last long due to internal problems and foreign invasions.