Vladimir Lenin
In July 1898, while still in Siberia, Lenin married Nadezhda Krupskaya. In 1899 he wrote a book he called The Development of Capitalism in Russia. In 1900, Lenin was set free from prison and allowed to go back home. He then traveled around Europe. He began to publish a Marxist newspaper called Iskra, the Russian word for "spark" or "lightning". He also became an important member of the Russian Social Democratic Labour Party, or RSDLP. In 1901 he began calling himself "Lenin".