On this day in 1783, Czarina Catherine the Great announced the annexation, following a favourable outcome in the Russo-Turkic Wars against the Ottoman Empire, of Crimea, the right-bank of the Kuban region and the Taman peninsula that separates the Azov from the Black Sea. Other territorial expansion during long reign included parts of the Polish-Lithuanian Commonwealth, Novorossiya (roughly corresponding to the Bessarabia region of Moldova and coastal areas of Ukraine) as well as Russian America. Also on this day in 1812, Czar Alexander I (grandson of the former) issued a decree to make Helsinki the capital of the semi-autonomous Grand Duchy of Finland—having seceded from Sweden and part of the Russian Empire from 1809 until 1917