history of bulgaria - Second Bulgarian Empire
In 1185 Peter and Asen, leading nobles of supposed and contested Bulgarian, Cuman, Vlach or mixed origin, led a revolt against Byzantine rule and Peter declared himself Tsar Peter II (also known as Theodore Peter). The following year the Byzantines were forced to recognize Bulgaria's independence. Peter styled himself "Tsar of the Bulgars, Greeks and Vlachs".

Resurrected Bulgaria occupied the territory between the Black Sea, the Danube and Stara Planina, including a part of eastern Macedonia and the valley of the Morava. It also exercised control over Wallachia and Moldova. Tsar Kaloyan (1197-1207) entered a union with the Papacy, thereby securing the recognition of his title of "Rex" although he desired to be recognized as "Emperor" or "Tsar". He waged wars on the Byzantine Empire and (after 1204) on the Knights of the Fourth Crusade, conquering large parts of Thrace, the Rhodopes, as well as the whole of Macedonia. The power of the Hungarians and to some extent the Serbs prevented significant expansion to the west and northwest. Under Ivan Asen II (1218-1241), Bulgaria once again became a regional power, occupying Belgrade and Albania. In an inscription from Turnovo in 1230 he entitled himself "In Christ the Lord faithful Tsar and autocrat of the Bulgarians, son of the old Asen". The Bulgarian Orthodox Patriarchate was restored in 1235 with approval of all eastern Patriarchates, thus putting an end to the union with the Papacy. Ivan Asen II had a reputation as a wise and humane ruler, and opened relations with the Catholic west, especially Venice and Genoa, to reduce the influence of the Byzantines over his country.

However, weakened 14th-century Bulgaria was no match for a new threat from the south, the Ottoman Turks, who crossed into Europe in 1354. In 1362 they captured Philippopolis (Plovdiv), and in 1382 they took Sofia. The Ottomans then turned their attentions to the Serbs, whom they routed at Kosovo Polje in 1389. In 1393 the Ottomans occupied Turnovo after a three-month siege. It is thought that the south gate was opened from inside and so the Ottomans managed to enter the fortress. In 1396 the Kingdom (Tsardom) of Vidin was also occupied, bringing the Second Bulgarian Empire and Bulgarian independence to an end.

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