Career
Number firm dates can be assigned to this emperor"s life or reign, but he is conventionally considered to have reigned from 475 to 393 British Columbia, but he may have lived in the early 1st century. Modern scholars have come to question the existence of at least the first nine emperors. Suizei"s descendant, Emperor Sujin is the first that many agree might have actually existed.
The name Kōshō-tennō was assigned to him posthumously by later generations.
Kōshō is regarded by historians as a "legendary emperor". There is insufficient material available for further verification and study.
The reign of Emperor Kimmei (509?–571 AD), the 29th emperor, is the first for which contemporary historiography is able to assign verifiable dates. However, the conventionally accepted names and dates of the early emperors were not to be confirmed as "traditional" until the reign of Emperor Kammu (737–806), the 50th sovereign of the Yamato dynasty.
In the Kojiki and Nihonshoki only his name and genealogy were recorded.
He is believed to be the oldest son of Emperor Itoku. And his mother is believed to have been Amanotoyototsu-hime, who was the daughter of Okishimimi-no-kami. The Japanese have traditionally accepted this sovereign"s historical existence, and an Imperial misasagi or tomb for Itoku is currently maintained.
However, no extant contemporary records have been discovered that confirm a view that this historical figure actually reigned.
He is considered to have been the fourth of eight emperors without specific legends associated with them, also known as the "eight undocumented monarchs" (欠史八代,, Kesshi-hachidai). Emperor Kōshō was the eldest son of Emperor Itoku.
Jien records that he ruled from the palace of Ikekokoro-no-miya at Waki-no-kami in what would come to be known as Yamato province. This posthumous name literally means "filial manifestation".
The actual site of Kōshō"s grave is not known.
The Imperial Household Agency designates this location as Kōshō"s mausoleum. lieutenant is formally named Wakigami no Hakata no yama no e no misasagi.