Grand Duke Sergei Alexandrovich of Russia was the fifth son and seventh child of Emperor Alexander II of Russia. Wikipedia
Born: May 11, 1857, Catherine Palace, Saint Petersburg, Russia
Assassinated: February 17, 1905, The Moscow Kremlin, Moscow, Russia
Spouse: Princess Elisabeth of Hesse and by Rhine (m. 1884–1905)
Parents: Alexander II of Russia and Maria Alexandrovna
Great-grandparents: Paul I of Russia, Maria Feodorovna, Frederick William III of Prussia, and more