As a young boy, Sir Christopher Lee met the assassins of Rasputin (Prince Yusupoff and Dmitri Pavlovich). He also met Rasputin's daughter, Maria in 1976. She told Lee that he had her father's "expression".
Filmed back-to-back with "Dracula: Prince of Darkness (1966)," using many of the same cast members and sets.
"Hammer Films" released this movie with the disclaimer "This is an entertainment, not a documentary. No attempt has been made at historical accuracy. All the characters and incidents may be regarded as fictitious." This precaution was taken because "MGM" had been sued in 1933 by Princess Irina Romanoff Yusupov, who claimed that an earlier movie about Rasputin had libelled her by erroneously portraying her as his mistress.
Allegedly, Christopher Lee wasn't all that impressed with the script so he opted to give a "larger-than-life" performance to compensate.
Rasputin has a confrontation with irate villagers in a small hut. This is the same hut Charles and Diana Kent took refuge in "Dracula: Prince of Darkness (1966)."