Bulgakov, Sergij: - SERGIJ NIKOLAEVICH BULGAKOV (1871-1944) is now widely regarded as one of the most significant theologians of the twentieth century. After turning away from his seminary education to Marxian social and economic theory, Bulgakov later moved towards idealism, and, finally, back to the Russian Orthodox Church. Expelled from the Soviet Union in 1922, he took refuge, eventually, in Paris, where he helped to set up the Institut de Théologie Orthodoxe Saint-Serge, and where he died in 1944.