, also known as 真津日子訶恵志泥命 was the fifth legendary emperor of Japan, according to the traditional order of succession. Very little is known about this Emperor due to a lack of material available for further verification and study. Kōshō is known as a "legendary emperor" among historians as his actual existence is disputed. Nothing exists in the Kojiki other than his name and genealogy. Kōshō's reign allegedly began in 475 BC, he had one wife and two sons. After his death in 393 BC, his second son supposedly became the next emperor.
In the Kojiki and Nihon Shoki, only his name and genealogy were recorded. The Japanese have traditionally accepted this sovereign's historical existence, and an Imperial misasagi(陵) or tomb for Kōshō is currently maintained; however, no extant contemporary records have been discovered that confirm a view that this historical figure actually reigned. Kōshō is believed to be the oldest son of Emperor Itoku, and his wife Amanotoyoto