The Byelorussian Soviet Socialist Republic, also known as Soviet Belarus or simply Belarus, was a republic of the Soviet Union (USSR). It existed between 1920 and 1922 as an independent state, and afterwards as one of fifteen constituent republics of the USSR from 1922 to 1991, with its own legislation from 1990 to 1991. The republic was ruled by the Communist Party of Byelorussia. It was also known as the White Russian Soviet Socialist Republic. Minsk was the capital and largest city of the republic.