It is worth noting that the half of Kuni no miyatsuko in the 'Kokuzohongi' (the original record of provincial governors) of the "Sendai Kujihongi" (Ancient Japanese History) was said to have been established under the reign of the Emperor Seimu.
『先代旧事本紀』の「国造本紀」に載せる国造の半数がその設置時期を成務朝と伝えていることも注目される。