The origins of the Russian historical claim to Crimea, which would culminate in the 2014 annexation of the territory, date to the 18th century, when the Russian Empire, under the Empress Catherine the Great, annexed the peninsula for the first time, in April 1783. While ostensibly recognised by the Ottoman Empire in December that year, the annexation sowed tensions which ultimately contributed to the outbreak of Russo-Turkish war of 1787–1792, in which the Ottoman Empire attempted to reverse it, but to no avail: the 1792 Treaty of Jassy, which formally ended the war, reaffirmed the 1783 annexation again. From 1802, Crimea constituted a southern part of the Taurida Governorate of the Russian Empire until the collapse thereof in 1917. During the Russian Civil War (1917–1921) Crimea changed hands multiple times, being "inter alia" the last territory held by the White Russian government in the European part of Russia in 1920, and finally became an autonomous republic within Russian Soviet Federative Socialist Republic (RSFSR) in 1921.