- Emperor of Austria (1916-1918).
- Children: Otto von Habsburg, Adelheid Maria Josefa Sixta Antonia Roberta Ottonia Zita Charlotte Luise Immakulata Pia Theresia Beatrix Franziska Isabelle Henriette Maximiliana Genoveva Ignatia Marcus d'Aviano (3 January 1914 - 3 October 1971); Robert Karl Ludwig Maximilian Michael Maria Anton Franz Ferdinand Josef Otto Hubert George Pius Johannes Marcus d'Aviano (8 February 1915 - 7 February 1996); Felix Friedrich August Maria vom Siege Franz Josef Peter Karl Anton Robert Otto Pius Michael Benedikt Sebastian Ignatius Marcus d'Aviano (b. 31 May 1916); Carl Ludwig Maria Franz Josef Michael Gabriel Antonius Robert Stephan Pius Gregor Ignatius Markus d'Aviano (10 March 1918 - 11 December 2007); Rudolph Syringus Peter Karl Franz Josef Robert Otto Antonius Maria Pius Benedikt Ignatius Laurentius Justiniani Marcus d'Aviano (b. 5 September 1919); Charlotte Hedwig Franziska Josefa Antonia Roberta Ottonia Pia Anna Ignatia Marcus d'Aviano (1 March 1921 - 23 July 1989); Elizabeth Charlotte Alphonsa Christina Theresia Antonia Josefa Roberta Ottonia Franziska Isabelle Pia Markus d'Aviano (31 May 1922 - 6 January 1993).
- Beatified by Pope John Paul II on 3 October 2004. As of 2008, the Catholic Church has recognized two miracles attributed to Emperor Karl.
- Succeeded Emperor Franz Josef as the last Emperor of Austria and the King of Hungary.
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