Vladimir Ilyich Ulyanov Lenin (1870 1924) Russian revolutionary, politician and theorist.

Vladimir Ilyich Ulyanov Lenin (April 10, 1870 - January 21, 1924) was a Russian revolutionary, politician, and political theorist. He served as the first and founding head of government of Soviet Russia from 1917 to 1924 and of the Soviet Union from 1922 to 1924. Under his administration, Russia, and later the Soviet Union, became a one-party socialist state governed by the Communist Party. Ideologically a Marxist, he developed a subset of Marxism called Leninism.
Born to an upper middle-class family in Simbirsk, Lenin embraced revolutionary socialist politics following his brother's 1887 execution. Expelled from Kazan Imperial University for participating in protests against the Russian Empire's Tsarist government, he devoted the following years to a law degree. He moved to Saint Petersburg in 1893 and became a senior Marxist activist. In 1897, he was arrested for sedition and exiled to Shushenskoye in Siberia for three years, where he married Nadezhda Krupskaya. After his exile, he moved to Western Europe, where he became a prominent theorist in the Marxist Russian Social Democratic Labour Party (RSDLP). In 1903, he took a key role in the RSDLP ideological split, leading the Bolshevik faction against Julius Martov's Mensheviks. Following Russia's failed Revolution of 1905, he campaigned for the First World War to be transformed into a Europe-wide proletarian revolution, which, as a Marxist, he believed would cause the overthrow of capitalism and its replacement with socialism. After the 1917 February Revolution ousted the Tsar and established a Provisional Government, he returned to Russia to play a leading role in the October Revolution in which the Bolsheviks overthrew the new regime.
Lenin's Bolshevik government initially shared power with the Left Socialist Revolutionaries, elected soviets, and a multi-party Constituent Assembly, although by 1918 it had centralized power in the new Communist Party. Opponents were suppressed in the Red Terror, a violent campaign administered by the state security services; tens of thousands were killed or interned in concentration camps. His administration defeated right and left-wing anti-Bolshevik armies in the Russian Civil War from 1917 to 1922 and oversaw the Polish–Soviet War of 1919–1921. Responding to wartime devastation, famine, and popular uprisings, in 1921 Lenin encouraged economic growth through the New Economic Policy. Several non-Russian nations had secured independence from the Russian Empire after 1917, but three were re-united into the new Soviet Union in 1922. His health failing, Lenin died in Gorki, with Joseph Stalin succeeding him as the pre-eminent figure in the Soviet government.
Widely considered one of the most significant and influential figures of the 20th century, Lenin was the posthumous subject of a pervasive personality cult within the Soviet Union until its dissolution in 1991. He became an ideological figurehead behind Marxism–Leninism and a prominent influence over the international communist movement.

In March 1923, Lenin suffered a third stroke and lost his ability to speak; that month, he experienced partial paralysis on his right side and began exhibiting sensory aphasia. By May, he appeared to be making a slow recovery, regaining some of his mobility, speech, and writing skills. In October, he made a final visit to the Kremlin. In his final weeks, Lenin was visited by Zinoviev, Kamenev, and Bukharin; the latter visited him at his Gorki mansion on the day of his death. On 21 January 1924, Lenin fell into a coma and died later that day. His official cause of death was recorded as an incurable disease of the blood vessels.
The Soviet government publicly announced Lenin's death the following day. On 23 January, mourners from the Communist Party, trade unions, and Soviets visited his Gorki home to inspect the body, which was carried aloft in a red coffin by leading Bolsheviks. Transported by train to Moscow, the coffin was taken to the House of Trade Unions, where the body lay in state. Over the next three days, around a million mourners came to see the body, many queuing for hours in the freezing conditions. On 26 January, the eleventh All-Union Congress of Soviets met to pay respects, with speeches by Kalinin, Zinoviev, and Stalin.
Against Krupskaya's protestations, Lenin's body was embalmed to preserve it for long-term public display in the Red Square mausoleum. During this process, Lenin's brain was removed; in 1925 an institute was established to dissect it, revealing that Lenin had suffered from severe sclerosis. In July 1929, the Politburo agreed to replace the temporary mausoleum with a permanent one in granite, which was finished in 1933. His sarcophagus was replaced in 1940 and again in 1970. For safety amid the Second World War, from 1941 to 1945 the body was temporarily moved to Tyumen. As of 2021, his body remains on public display in Lenin's Mausoleum on Red Square.