Grigori —, Siberian peasant monk murdered in St Petersburg, Russia in 1916 (8)

I believe the answer is:

rasputin

(Other definitions for rasputin that I've seen before include "This madman" , "Alexandra's favourite" , "Russian holy man who influenced a tsar" , "Holy man influential in Russian court" , "Puritans (anag) - Russian monk" .)

I've seen this clue in The Mirror.

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