Question: Who is Princess Irina Nikolaïevna Orlova's maternal grandmother?
Sentence (from "Princess Nadejda Petrovna of Russia"): Princess Nadejda Petrovna of Russia (Russian: Надежда Петровна; 3 March 1898 – 21 April 1988) was the third child of Grand Duke Peter Nikolaevich of Russia and his wife, the former Princess Milica of Montenegro.
Relevant evidence: Yes