Franz Joseph I of Austria
Franz Joseph I or Francis Joseph I (Franz Joseph Karl; 18 August 1830 – 21 November 1916) was Emperor of Austria, King of Hungary, and monarch of many other states of the Austro-Hungarian Empire, from 2 December 1848 to his death. From 1 May 1850 to 24 August 1866 he was also President of the German Confederation. He was the longest-reigning Emperor of Austria and King of Hungary, as well as the third-longest-reigning monarch of any country in European history, after Louis XIV of France and Johann II of Liechtenstein.
Otto von Habsburg
The eldest son of Charles I and IV, the last Emperor of Austria and King of Hungary, and his wife, Zita of Bourbon-Parma, Otto was born as third in line to the thrones, as Archduke Otto of Austria, Royal Prince of Hungary, Bohemia, and Croatia. With his father's accession to the thrones in 1916, he was likely to become emperor and king. As his father never abdicated, Otto was considered by himself, his family and Austro-Hungarian legitimists to be the rightful emperor-king from 1922.