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
History of Austria the Ottomans except Banat of Temeswar and Syrmia in the Austro-Russian–Turkish War despite being allied with Russia. These Silesian Wars initiated a long-standing tension between Austria and Prussia. Maria Theresa effectively reigned as Empress through her husband, Francis Stephen of Lorraine (d. 1765) and they founded the new dynasty of Habsburg-Lorraine. During her reign extensive reforms were initiated, and when Francis died in 1765, these were continued by her son, Joseph II (Emperor 1765–1790; Archduke 1780–1790). However his successor, his brother, Leopold II (1790–1792), was much more conservative. The next emperor, his son Francis II (1792–1835), found himself at war