Maria Feodorovna ( 26 November 1847 â `` 13 October 1928 ) , born Princess Dagmar of Schleswig-Holstein-Sonderburg-Gl Ã 1\/4 cksburg and later Princess Dagmar of Denmark , was the Empress consort of Russia . Maria Feodorovna ( 26 November 1847 â `` 13 October 1928 ) , born Princess Dagmar of Schleswig-Holstein-Sonderburg-Gl Ã 1\/4 cksburg and later Princess Dagmar of Denmark , was Empress consort of Russia as spouse of Emperor Alexander III .