Franz Joseph I or Francis Joseph I was Emperor of Austria, King of Hungary, Croatia and Bohemia, and king of other countries of the Austro-Hungarian Empire, from 2 December 1848 until his death. life. From 1 May 1850 to 24 August 1866, he was also the President of the Federation of the German Federation. He is the longest reigning ruler of Austria and Hungary, as well as the sixth longest reigning monarch of any nation in history. In December 1848, Emperor Ferdinand abdicated the throne at Olomouc, as part of Minister-President Felix zu Schwarzenberg's plan to end the 1848 revolutions in Hungary. This allowed Ferdinand's nephew, Franz Joseph, to take the throne. Considered reactionary, Franz Joseph spent the first part of his reign fighting against constitutionalism in his fields.