Peter Kropotkin (1842–1921) was the foremost theorist of the anarchist movement. Born a Russian prince, he rejected his title to become a revolutionary, seeking a society based on freedom, equality, and solidarity. Imprisoned for his activism in Russia and France, his writings include The Conquest of Bread; Fields, Factories, and Workshops; Anarchism, Anarchist-Communism, and the State; Memoirs of a Revolutionist; and Modern Science and Anarchism.