Kōshō is the fifth emperor (tenno) of
Japan to appear on the traditional
list of emperors. This
posthumous name (if he ever lived) literally means "filial manifestation".Later generations have included this name to the list of emperors (tenno) of Japan (as 孝昭天皇, Kōshō Tennō), thus making him posthumously an emperor and assigning him as one of the early sovereigns and ancestors of the
dynasty that has reigned unbroken since time immemorial. If he lived, at his time the title tenno was not yet used, and the polity he possibly ruled did certainly not contain all or even the most of Japan. Concluding from his alleged successors in beginnings of historical time, also Kosho would have been a chieftain, local king, in early
Yamato tribal society.
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