Alexander I of Russia ( , Aleksandr I Pavlovich ) ( â `` ) , also known as Alexander the Blessed ( , Aleksandr Blagoslovennyi ) was Emperor of Russia from 23 March 1801 to 1 December 1825 and the first Russian King of Poland from 1815 to 1825 . Alexander I of Russia ( , Aleksandr I Pavlovich ) ( â `` ) , also known as Alexander the Blessed ( , Aleksandr Blagoslovennyi ) served as Emperor of Russia from 23 March 1801 to 1 December 1825 and the first Russian King of Poland from 1815 to 1825 .