Sergei Michailovich Trufanov (Russian: ?????´? ????´?????? ?????´???; formerly Hieromonk Iliodor or Hieromonk Heliodorus, Russian: ????????? ???????; 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.