Grand Duke Sergei Alexandrovich of Russia 11 May 1857 17 February 1905 was the fifth son and seventh child of Alexander II of Russia and Marie of Hesse and by Rhine he was an influential figure during the reign of his brother Alexander III of Russia and his nephew Nicholas II , who was also married brother in law through Sergei marriage to Elizabeth Feodorovna , the sister of the last Empress of Russia Alexandra Feodorovna .