Julius Martov, Russian politician (d. 1923)
Julius Martov or L. Martov (Ма́ртов; born Yuliy Osipovich Tsederbaum; 24 November 1873 – 4 April 1923) was a politician and revolutionary who became the leader of the Mensheviks in early 20th-century Russia. He was arguably the closest friend Vladimir Lenin ever had, and was a friend and mentor of Leon Trotsky, who described him as the "Hamlet of Democratic Socialism".