According to the theory of the Kyushu dynasty, Wakoku had been founded by the first century around the area of the northern part of Kyusu, and the King of Wa placed the capital in Wanonanokuni near the Hakata Bay and offered tribute to the Han Dynasty, and then transferred it to Dazaifu (govermental headquarters in northern Kyushu from the late Kofun period (300-700) through the Heian Period) to exist till the end of the seventh century.
1世紀には倭国が北部九州を中心とした地域に成立し、倭国王は博多湾近くの倭奴国に首都をおいて漢に朝貢し、後には太宰府に都を移して7世紀末まで存在したとする九州王朝説がある。