144 hàng · This list of emperors of Japan presents the traditional order of succession. Records of the reigns are compiled according to the traditional Japanese calendar.In the nengō system which has been in use since the late-seventh century, years are numbered using the Japanese era name and the number of years which have taken place since that nengō era started.

The 121st tennō, or emperor, of Japan, Emperor Kōmei, had a tumultuous reign, which witnessed Japan being pushed to open to the Western world. He was the last Japanese emperor with multiple nengō, or era names. He was known for imposing an order of killing and persecuting foreign traders and officials.