Charles I or Karl I ("Karl Franz Joseph Ludwig Hubert Georg Otto Maria"; 17 August 18871 April 1922) was Emperor of Austria, King of Hungary (as Charles IV, ), King of Croatia, King of Bohemia (as Charles III, ), and the last of the monarchs belonging to the House of Habsburg-Lorraine to rule over Austria-Hungary. The son of Archduke Otto of Austria and Princess Maria Josepha of Saxony, Charles became heir presumptive of Emperor Franz Joseph after his uncle Archduke Franz Ferdinand of Austria was assassinated in 1914. In 1911, he married Princess Zita of Bourbon-Parma.