Vladimir Ilyich Ulyanov[b] (22 April [O.S. 10 April] 1870 – 21 January 1924), better known as Vladimir Lenin,[c] was a Russian revolutionary, politician and political theorist who was the founder and first head of government of Soviet Russia from 1917 until his death in 1924, and of the Soviet Union from 1922 until his death. The founder and leader of the Bolsheviks, Lenin led the October Revolution which established the world’s first socialist state. His government won the Russian Civil War and consolidated power in a one-party state under the Communist Party. Ideologically a Marxist, his developments to the ideology are called Leninism.