It is considered that kings of the Yamato Dynasty, which was supposedly established in mid or later third century, externally called themselves the King of Wa or the King of Wakoku, and in fact, Shoo (princes without imperial proclamation) who were actively involved in friendly relations with Chinese Dynasties from the late fourth to late fifth century called themselves the King of Wakoku (The five kings of Wa).
3世紀中葉-後期に成立したとされるヤマト王権の王たちも対外的には倭王・倭国王を称したと考えられており、実際に4世紀後期から5世紀末にかけて中国王朝と活発な通交を重ねた諸王も中国に対して倭王または倭国王を称している（倭の五王）。