The collection of works of the outstanding Russian pathologist professor of the MDA I.V. Popov (1867-1938) includes his works on the holy fathers of the Eastern and Western Church of the 2nd - 4th centuries. Professor I.V. Popov, who headed the Department of Patrology at the MDA, made a significant contribution to the development of domestic pathological science. His works are recognized and appreciated by leading experts in patristics in Russia and abroad. For many years, the unique theological heritage of I.V. Popov was under spud. This collection includes his works published in rare and inaccessible publications.