Sergei Michailovich Trufanov (Russian: Серге́й Миха́йлович Труфа́нов; formerly Hieromonk Iliodor or Hieromonk Heliodorus, Russian: Иеромонах Илиодор; October 19, 1880 – 28 January 1952) was a lapsed hieromonk, a charismatic preacher, an enfant terrible of the Russian Orthodox church, panslavist, and actor. He is known primarily for his semi-autobiographical book about Rasputin. In this work he was supported by Maxim Gorky, since 1902 a friend of Lenin. Gorky hoped that Trufanov's story on Rasputin would discredit the Tsar's family and eventually contribute to the revolutionary propaganda.