Emperor Kōan (孝安天皇 Kōan Tennō) was the sixth imperial ruler of Japan to appear on the traditional list of emperors. No firm date can be assigned to this emperor and he is regarded by historians as a "legendary emperor". He was the fifth one of eight emperors without legend. In Kojiki and Nihonshoki only his name and genealogy were recorded. The Japanese traditionally accepted his historical existence, and a tomb was attributed to him, but contemporary studies support the view that no such person existed. His Imperial Majesty, Emperor Akihito of Japan The Emperor of Japan (天皇, tennō) is Japans titular head of state and the head of the Japanese imperial family. ... Kojiki or Furukotofumi (古事記) is the oldest known historical book about the ancient history of Japan. ... Nihonshoki (日本書紀) is the second oldest history book about the ancient history of Japan. ...

Meiji era print of Emperor Kosho Emperor Kōshō (孝昭天皇 Kōshō Tennō) was the fifth imperial ruler of Japan to appear on the traditional list of emperors. ... The following is a traditional list of Emperors of Japan. ... Emperor Kōrei (孝霊天皇 Kōrei Tennō) was the seventh imperial ruler of Japan to appear on the traditional list of emperors. ...