Bulgarian Declaration of Independence

The de jure independence of Bulgaria (Bulgarian: Независимост на България, romanized: Nezavisimost na Bǎlgariya) from the Ottoman Empire was proclaimed on 5 October [O.S. 22 September] 1908 in the old capital of Tarnovo by Prince Ferdinand of Bulgaria, who afterwards took the title "Tsar". == Background == Bulgaria had been a widely autonomous principality since 13 July 1878 Congress of Berlin and the end of the Russo-Turkish War (1877–78).

Source: Wikipedia — Bulgarian Declaration of Independence (CC BY-SA 4.0)