One of the few members of the Russian aristocracy to become a revolutionary, Prince Peter Kropotkin (1842‒1921) renounced his title at the age of 12. He later became one of the leading theorists of anarchism. Forced to flee his homeland in the 1870s to avoid arrest for his revolutionary activities against the czarist government, the noted geographer and social philosopher lived in exile, mainly in England, for the next 42 years of his life...