The Declaration of Pillnitz was a joint statement issued on 27 August 1791 by Leopold II, Holy Roman Emperor (r. 1790-1792) and King Frederick William II of Prussia (r. 1786-1797). The declaration appealed to all European powers to unite against the French Revolution (1789-99) and restore King Louis XVI of France (r. 1774-1792), reduced to a constitutional monarch, to his full powers.
This is a companion discussion topic for the original content at https://www.worldhistory.org/Declaration_of_Pillnitz/.