Emperor Charles I wearing the crown of St Stephen on his head, together with his wife Zita and his son Otto as the newly crowned rulers of the Kingdom of Hungary. 30 December 1916. Photo NAC/IKC, Schuhmann Heinrich, ref. 1-E-720
Visit of Charles of Habsburg (in light coat) and his wife Zita to Balice, around 1912. Thus, before assuming the throne. Photo: NAC/IKC, catalogue number: 1-H-14-1
Charles I with his wife Zita and children Franz Joseph Otto and Adelheid, 1914. Photo Hermann C. Kosel/Ullstein Bild via Getty Images
Austro-Russian battles for Przemyśl. Charles visits the army near Przemyśl, 1915. Photo: NAC/IKC, ref. 1-H-30-4
Emperor Franz Joseph I of Austria and Archduke Charles of Habsburg. At the time of his death in November 1916, the Emperor believed that an Austro-Hungarian victory in the First War was impossible. He was succeeded by his nephew Charles I, the last Austrian Emperor. Photo: The Print Collector/Print Collector/Getty Images
Funeral of Emperor Francis Joseph of Austria (18.08.1830-21.11.1916). In the photo, Charles I with Empress Zita Bourbon-Parmenian and Duke Otto Habsburg; in the second row: Frederick August III. (Saxony), Ludwig III. (Bavaria), Ferdinand I. (Bulgaria); in the third row Gustav VI. Adolf (Sweden) Photo: Robert Sennecke/Ullstein Bild via Getty Images
Circa 1916: Emperor Charles of Austria with his wife Zita. Photo: Hulton Archive/Getty Images
Emperor Charles I of Habsburg. Photo: Hulton Archive/Getty Images
Emperor Charles I of Austria visiting Emperor Wilhelm II of Germany at army headquarters, World War I, 1917. Photograph from the book 'Der Grosse Krieg in Bildern'. Photo: Art Media/Print Collector/Getty Images
Charles I with his son Franz Joseph Otto (Otto von Habsburg), 1916. Photo: Madame d'Ora (Dora Kallmus)/Ullstein Bild via Getty Images
Charles I giving lessons to his son Otto, Prangins, Switzerland, photo from The Illustrated London News, vol 156, no 4229, 8 May 1920. Photo by Ullsten Bild/Getty Images
Austrian royal family shortly before the fall of the Austro-Hungarian Habsburg dynasty. The last Emperor of Austria: Charles I with Empress Zita and Prince Otto, who was later a Member of Parliament from Munich. Photo by Michael Nicholson/Corbis via Getty Images
Otto Habsburg (20.11.1912-04.07.2011) - publicist, politician, CSU, Austria. Son of the last Austrian emperor, 1990. Photo Business Picture/Ullstein Bild via Getty Images
Charles, last emperor of the Habsburg dynasty. Saint. An errant knight seeking peace