Princess Elisabeth of Hesse and by Rhine, later Grand Duchess Elizabeth Feodorovna of Russia, was a German Hessian and Rhenish princess of the House of Hesse-Darmstadt, and the wife of Grand Duke Sergei Alexandrovich of Russia, the fifth son of Emperor Alexander II of Russia and Princess Marie of Hesse and by Rhine. She was also a maternal great-aunt of Prince Philip, Duke of Edinburgh, the consort of Queen Elizabeth II.
A granddaughter of Queen Victoria and an older sister of Alexandra, the last Russian Empress, Elisabeth became famous in Russian society for her beauty and charitable works among the poor. After the Socialist Revolutionary Party's Combat Organization assassinated her husband with a bomb in 1905, Elisabeth publicly forgave Sergei's murderer, Ivan Kalyayev, and campaigned without success for him to be pardoned.
Wikipedia https://en.wikipedia.org/wiki/Princess_Elisabeth_of_Hesse_and_by_Rhine_(1864–1918)
Address (Unnamed Road), Darmstadt 64283, Germany
Coordinates 49°52'32.513" N 8°39'13.839" E