Grigori Rasputin was a human being who is now a ghost.
An infamous Russian mystic, Grigori Rasputin was famous for his hypnotic powers, which impressed even the Czar. After his infamous death, his ghost came to haunt one of the Changing Portraits curated at the Haunted Mansion; in testament to his hypnosis, his likeness would morph into one huge, eerie, impossible eye. However, the painting was no longer present in the Mansion's public areas by the time it opened to mortals in Disneyland in 1969.
Behind the scenes
Grigori Rasputin was one of the planned but ultimately scrapped historical ghosts for The Haunted Mansion. The portrait was created by Marc Davis during Walt Disney's lifetime, and vetoed by Disney for fear that one of Rasputin's surviving descendants might take offense. The composition of the portrait was recycled by Davis for the Ogre, one of the Sinister Eleven.