Tokyo dates back to 1603, when Tokugawa Ieyasu who was the first Tokugawa shogun built his castle in Edo, present Tokyo. Since then, it had continued to grow as the largest political city in Japan, and had become the largest city in the world with a population of one million at the beginning of the 19th century. This population exceeded the combined population of Kyoto and Osaka at that time.
Kyoto was the capital of Japan and Osaka was the largest economic city of Japan.
Edo was renamed Tokyo in 1868, and the capital was moved to Tokyo the next year. In this connection, the city name of Tokyo means Kyoto in the east. In line with the capital relocation, the Emperor moved to Tokyo accompanied by most of the nobles in Kyoto.
Kyoto lost the emperor for the first time since 794, and Tokyo's new development began. Tokyo Metropolis (Tokyo-to), 2,200 square kilometers in area, has a population of 14 mllion, but the daytime population reaches 17 million because many commuters flow into Tokyo every morning. Tokyo is officially regarded as one of the largest cities in the world together with New York, London and Paris.
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