 Until 1812, the term "Bessarabia" referred to the region between the Danube, Dniester, the Black Sea shores, and the Upper Trajan Wall, slightly larger than what today is called Budjak.By the Treaty of Bucharest of May 28, 1812 between the Ottoman Empire and the Russian Empire — concluding the Russo-Turkish War, 1806-1812 — the latter annexed the eastern half of the Principality of Moldavia.That region was then called "Bessarabia".