Meanwhile, France's monarchical neighbors were getting a little nervous about all this republic business, especially Leopold II, who in addition to being the not-holy, not-Roman, and not-imperial Holy Roman Emperor, was Marie Antoinette's brother. I should note, by the way, that at this point the Holy Roman Empire was basically just Austria. Also, like a lot of monarchs, Leopold II liked the idea of monarchies, and he wanted to keep his job as a person who gets to stand around wearing a dress pointing at nothing, owning winged lion monkeys made out of gold. And who can blame him? So he and King William Frederick II of Prussia together issued the Declaration of Pilnitz, which promised to restore the French monarchy. At this point, Louis and the National Assembly developed a plan. Let's invade Austria.