 One of them, Konstantin Kuzakov, later taught philosophy at the Leningrad Military Mechanical Institute, but never met his father.The other, Alexander, was the son of Lidia Pereprygia; he was raised as the son of a peasant fisherman and the Soviet authorities made him swear never to reveal that Stalin was his biological father.The historian Robert Conquest stated that Stalin, "perhaps[…] determined the course of the twentieth century" more than any other individual.