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The Mayerling incident is the series of events surrounding the apparent murder–suicide pact of Rudolf, Crown Prince of Austria, and his mistress, Baroness Mary Vetsera. They were found dead on 30 January 1889 in an imperial hunting lodge in Mayerling. Rudolf, who was married to Princess Stéphanie of Belgium, was the only son of Emperor Franz Joseph and Empress Elisabeth, and was heir apparent to the throne of Austria-Hungary.
Charles I and IV (German: Karl Franz Josef Ludwig Hubert Georg Otto Maria, Hungarian: Károly Ferenc József Lajos Hubert György Ottó Mária; 17 August 1887 – 1 April 1922) was Emperor of Austria (as Charles I), King of Hungary (as Charles IV), and the ruler of the other states of the Habsburg monarchy from November 1916 until the monarchy was abolished in November 1918. He was 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 when his uncle Archduke Franz Ferdinand of Austria was assassinated in 1914. In 1911, he married Princess Zita of Bourbon-Parma.
Charles succeeded to the thrones in November 1916 following the death of his grand-uncle, Franz Joseph. He began secret negotiations with the Allies, hoping to peacefully end the First World War, but was unsuccessful. Despite Charles's efforts to preserve the empire by returning it to federalism and by championing Austro-Slavism, Austria-Hungary hurtled into disintegration: Czechoslovakia and the State of Slovenes, Croats and Serbs were proclaimed, and Hungary broke monarchic ties to Austria by the end of October 1918. Following the Armistice of 11 November 1918, Charles "renounced any participation" in government affairs, but did not abdicate. However, the Republic of German-Austria was proclaimed the following day, and in April 1919 the National Assembly formally dethroned the Habsburgs and banished Charles from German-Austria for life.
A ball is a formal dance event often characterised by a banquet followed by a social dance. Ball dancing emerged from formal dances during the Middle Ages and carried on through different iterations throughout succeeding centuries, such as the 17th century Baroque dance and the 18th century cotillion. Several variations exists such as the masquerade and debutante ball as well as the more modern prom.