Grand Duke Peter Nikolaevich of Russia (Russian: Пётр Никола́евич Рома́нов; 22 January [O.S.

The Grand Duke joined a cult nick-named "the black peril", a group interested in the occult.

They are credited with introducing first a charlatan mystic named merely Philippe, and then, with graver consequences, Grigori Rasputin (1869–1916) to the Imperial family.

Prince Felix Yussupov (1887–1967) – who was their neighbour in Koreiz – once described Znamenka, the Grand Duke and Duchess's palace, as "the central point of the powers of evil".

Here Grand Duke Peter Nicholaievich died at Cap d'Antibes, near Antibes, on 17 June 1931.