The Bois de Boulogne was the idea of Napoleon III, shortly after he staged a coup d'état and elevated himself from the President of the French Republic to Emperor of the French in 1852. When Napoleon III became Emperor, Paris had only four public parks - the Tuileries Gardens, the Luxembourg Garden, the Palais-Royal, and the Jardin des Plantes - all in the center of the city. There were no public parks in the rapidly growing east and west of the city. During his exile in London, he had been particularly impressed by Hyde Park, by its lakes and streams and its popularity with Londoners of all social classes. Therefore, he decided to build two large public parks on the eastern and western edges of the city where both the rich and ordinary people could enjoy themselves.