1792 Imperial election 21 at Varennes-en-Argonne. On August 27, Leopold and Frederick William II of Prussia, king of Prussia, issued the Declaration of Pillnitz, calling for the release of Louis and Marie Antoinette and promising that, if his safety was threatened, and with the support of the other monarchs of Europe, they would go to war to restore him. The National Assembly interpreted the declaration as a declaration of war against the revolutionary government. On April 20, 1792, it declared war on Leopold's son Francis II, Holy Roman Emperor, his successor as king of Hungary, king of Croatia and king of Bohemia. The
Francis II Rákóczi Francis II Rákóczi Francis II Rákóczi (, ; 27 March 1676 – 8 April 1735) was a Hungarian nobleman and leader of the Hungarian uprising against the Habsburgs in 1703-11 as the prince ("fejedelem") of the Estates Confederated for Liberty of the Kingdom of Hungary. He was also Prince of Transylvania, an Imperial Prince, and a member of the Order of the Golden Fleece. Today he is considered a national hero in Hungary. His full title was: "Franciscus II. Dei Gratia Sacri Romani Imperii & Transylvaniae princeps Rakoczi. Particum Regni Hungariae Dominus & Siculorum Comes, Regni Hungariae Pro Libertate Confoederatorum