The Congress of Berlin (13 June – 13 July 1878) was a meeting of the representatives of the era's six great powers in Europe (Russia, Great Britain, France, Austria-Hungary, Italy and Germany), the Ottoman Empire and four Balkan states (Greece, Serbia, Romania and Montenegro). It aimed at determining the territories of the states in the Balkan Peninsula after the Russo-Turkish War of 1877–78 and came to an end with the signing of the Treaty of Berlin, which replaced the preliminary Treaty of San Stefano, which had been signed three months earlier between Russia and the Ottoman Empire.