Napoléon Bonaparte seized power in a coup d'état, reunited the country and declared himself Emperor of the French, he crowned by Pope Pius VII as Napoleon I of the French Empire, on 2 December 1804 at Notre Dame de Paris. His militaristic ambition which, at first, made him the ruler of most of western Europe were finally his downfall. In 1815 he was defeated in
Waterloo (Belgium) by the Seventh Coalition - United Kingdom, the Netherlands, Hanover, Nassau, Brunswick, and Prussia. He is still revered in some Eastern European countries as its armies and its government brought with them the ideas of the French philosophers.