There were references to the kings of Wakoku during that time in the history books of China, who were called the five kings of Wa, such as San, Chin, Sei, Ko, and Bu,
この時期の倭国王（倭王）は、中国史書に名が見える者が、讃、珍、済、興、武という5名おり、倭の五王と呼ばれている。