Emperor Seimu is an early emperor described in the Kojiki; he is considered the 13th Emperor of Japan by the "traditional" counting. It is unclear whether he was a historical figure, or should be regarded as more purely legendary.
According to the Kojiki, it was during the reign of Emperor Seimu that the borders were determined, and the land developed.
|Emperor of Japan
- David Lu, Japan: A Documentary History, 37.