Count Lev Nikolayevich Tolstoy ( 9 September [O.S. 28 August] 1828 – 20 November [O.S. 7 November] 1910), usually referred to in English as Leo Tolstoy, was a Russian writer who is regarded as one of the greatest authors of all time. He is best known for the novels War and Peace (1869) and Anna Karenina (1877), often cited as pinnacles of realist fiction.

Tolstoy's ideas on nonviolent resistance, expressed in such works as The Kingdom of God Is Within You, were to have a profound impact on such pivotal 20th-century figures as Mohandas Gandhi, Martin Luther King, Jr., and James Bevel.