High Quality Content by WIKIPEDIA articles! In Bulgarian historiography, the term Liberation of Bulgaria is used to denote the events of the Russo-Turkish War of 1877-78 that led to the re-establishment of Bulgarian state with the Treaty of San Stefano of March 3, 1878, after the complete conquest of the Second Bulgarian Empire, which finished in 1396. According to this treaty, the Ottoman Empire was deprived of a big part of its territory, which were given to the client state - Bulgaria.