Prince Pyotr Alexeyevich Kropotkin (9 December 1842 – 8 February 1921) was a Russian zoologist, activist, philosopher, economist, writer, scientist, evolutionary theorist, geographer and one of the world's foremost anarcho-communists. Kropotkin advocated a communist society free from central government and based on voluntary associations between workers. Because of his title of prince, he was known by some as "the Anarchist Prince". Some contemporaries saw him as leading a near perfect life, including Oscar Wilde, who described him as "a man with a soul of that beautiful white Christ which seems coming out of Russia." He wrote many books, pamphlets and articles, the most prominent being The Conquest of Bread and Fields, Factories and Workshops, and his principal scientific offering, Mutual Aid: A Factor of Evolution. He also contributed the article on anarchism to the Encyclopædia Britannica Eleventh Edition.