According to "Gishiwajinden" (literally, an 'Account of the Wa' in "The History of the Wei Dynasty") in the third century, the country which has a king is `Jo koku' and its an enemy country, `Kunakoku' only.
3世紀の『魏志倭人伝』で王が居る国は「女王国」および敵国の「狗奴国」のみである。