Question: Why did Grand Duke Kirill Vladimirovich Of Russia's wife die?
Answer: stroke

In 1926, Kirill proclaimed himself emperor in exile and Victoria supported her husband's claims. Victoria died after suffering a stroke while visiting her daughter Maria in Amorbach. Grand Duke Kirill Vladimirovich of Russia, ("Kirill Vladimirovich Romanov"; – 12 October 1938) was a son of Grand Duke Vladimir Alexandrovich of Russia, a grandson of Emperor Alexander II and a first cousin of Nicholas II, Russia’s last Tsar