Otto von Habsburg[1][2] (given names: Franz Joseph Otto Robert Maria Anton Karl Max Heinrich Sixtus Xaver Felix Renatus Ludwig Gaetan Pius Ignatius, Hungarian: Ferenc József Ottó Robert Mária Anton Károly Max Heinrich Sixtus Xaver Felix Renatus Ludwig Gaetan Pius Ignác; 20 November 1912 – 4 July 2011),[3][4] was the last Crown Prince of the Austro-Hungarian Empire.[5] His father, Charles, was the Emperor of Austria and the King of Hungary. The murder of his great uncle, Archduke Franz Ferdinand of Austria was the event that led to the start of World War I.[5] His family fled Austria in 1919 after the war.[6]
He was buried in the Imperial Tomb in Vienna, but his heart was buried at an abbey near Budapest, Hungary, as part of a tradition that goes back to medieval times.[6]
During his lifetime he was also known as Archduke Otto of Austria.
↑Otto was born as His Imperial and Royal Highness Archduke Otto of Austria, Royal Prince of Hungary and Bohemia and became the Crown Prince of these countries in 1916. After 1919, titles of nobility were formally abolished in Austria, thus in official use the "von" disappeared before Habsburg. The same applied after Habsburg became a German citizen (see Printausgabe der deutschen Wochenzeitung die Zeit of 21 July 2011, p. 36). By courtesy, he would also be referred to by the European royal and princely courts by his former style and title, i.e. as His Imperial and Royal Highness Archduke Otto of Austria. In the Austrian republic the authorities referred to him from 1919 as Otto Habsburg-Lothringen, a name he never used himself. Otto did not live in Austria after 1919, and his citizenship there was revoked by Adolf Hitler in 1941, making him stateless. His Austrian citizenship was only restored in 1965. Otto later became a citizen of Germany (in 1978) and Croatia (in 1990) and was issued passports of these countries, where his official name was Otto von Habsburg. As a Member of the European Parliament for Germany, his official name in the European Union was Otto von Habsburg. On his website, he used the style and name His Imperial and Royal Highness Dr. Otto von Habsburg.