Today, 211 years ago, on October 1, 1814 (August 18, 1814 in the lunar calendar), the participating countries of the Anti-French Alliance held a meeting in Vienna, Austria. On October 1, 1814, the participating countries of the Anti-French Alliance held a meeting in Vienna, Austria, to discuss and deal with post-war matters. The meeting ended on June 9, 1815. The meeting was attended by the emperors of Russia, Prussia and Austria, as well as prime ministers and princes of various countries, with a total of 216 delegates. Austrian Prime Minister Metternich, who is the chairman of this meeting. Comment: There are many conflicts among countries in the meeting because of the distribution of interests, but the meeting laid the foundation for the later establishment of the "Vienna System" with the "Holy Alliance" as the core