Question: What is the date of death of Princess Anastasia Of Montenegro's mother?
Sentence (from "Princess Helen of Serbia"): Helen was also a niece of Anastasia of Montenegro (or "Stana"), wife of Grand Duke Nicholas Nikolaevich of Russia, and of Milica of Montenegro, wife of Grand Duke Peter Nicolaievich of Russia, the women who introduced Grigori Rasputin to Tsarina Alexandra.
Relevant evidence: No