The Congress of Berlin (13 June – 13 July 1878) was a meeting of the representatives of the Great Powers of the time (Russia, Great Britain, France, Austria-Hungary, Italy and Germany), four Balkan states (Greece, Serbia, Romania and Montenegro) and the Ottoman Empire, aiming at determining the territories of the states in the Balkan peninsula following the Russo-Turkish War of 1877–78. The Congress came to an end with the signing of the Treaty of Berlin, which replaced the preliminary Treaty of San Stefano signed three months earlier between Russia and the Ottoman Empire.