The Japanese capital city is EDO, which is a three-letter word. EDO was the former name of Tokyo, which is now the capital of Japan. It was the seat of power for the Tokugawa shogunate from 1603 to 1868. During this period, EDO grew into one of the largest cities in the world with a population of over one million people. After the Meiji Restoration in 1868, the emperor and imperial court moved to EDO, which was renamed Tokyo. Today, Tokyo is the most populous metropolitan area in the world and the center of Japanese culture and politics.