<P> The Declaration of Pillnitz was a statement issued on 27 August 1791 at Pillnitz Castle near Dresden (Saxony) by Frederick William II of Prussia and the Habsburg Holy Roman Emperor Leopold II who was Marie Antoinette's brother . It declared the joint support of the Holy Roman Empire and of Prussia for King Louis XVI of France against the French Revolution . </P> <P> Since the French Revolution of 1789, Leopold had become increasingly concerned about the safety of his sister, Marie - Antoinette, and her family but felt that any intervention in French affairs would only increase their danger . At the same time, many French aristocrats were fleeing France and taking up residence in neighbouring countries, spreading fear of the Revolution and agitating for foreign support to Louis XVI . After the Flight to Varennes in June 1791, Louis had been arrested and was imprisoned . On 6 July 1791, Leopold issued the Padua Circular, calling on the sovereigns of Europe to join him in demanding Louis' freedom . </P> <P> The declaration stated that Austria would go to war if and only if all the other major European powers also went to war with France . Leopold chose this wording so that he would not be forced to go to war; he knew the British prime minister, William Pitt did not support war with France . Leopold issued the declaration only to satisfy the French emigres who had taken refuge in his country and were calling for foreign interference in their homeland . </P> <P> Calling on European powers to intervene if Louis was threatened, the declaration was intended to serve as a warning to the French revolutionaries to stop infringing on the king's prerogatives and to permit his resumption of power . </P>

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