Question: Who is the maternal grandfather of Princess Irina Alexandrovna Of Russia?
Sentence (from "Princess Irina Alexandrovna of Russia"): She was also the only niece of Tsar Nicholas II of Russia, and the wife of the wealthiest man in Imperial Russia, Prince Felix Felixovich Yusupov, one of the men who murdered Grigori Rasputin, "holy healer" to her cousin, the hemophiliac Tsarevich Alexei Nikolaevich of Russia, in 1916.
Relevant evidence: No