Emperor Kōkaku
Outside of the Kiki, the reign of Emperor Kinmei ( – 571 AD) is the first for which contemporary historiography is able to assign verifiable dates. The conventionally accepted names and dates of the early Emperors were not confirmed as "traditional" though, until the reign of Emperor Kanmu between 737 and 806 AD. The lineal ancestor of the current reigning emperor can be traced back to Emperor Kōkaku, who lived a thousand years later.