Question: When did Grand Duchess Elena Vladimirovna Of Russia's mother die?
Sentence (from "Grand Duchess Elena Vladimirovna of Russia"): Grand Duchess Elena Vladimirovna of Russia (17 January 1882 – 13 March 1957), sometimes known as Helen, Helena, Helene, Ellen, Yelena, Hélène, or Eleni, was a Russian grand duchess as the only daughter and youngest child of Grand Duke Vladimir Alexandrovich of Russia and Duchess Marie of Mecklenburg-Schwerin.
Relevant evidence: Yes