There are many mistakes in the descriptions of Nihon Shoki and Shokunihon Shoki about the missions dispatched to Japan during the Sui and Tang Dynasties. Therefore, a critical study is particularly necessary for making use of the two books as historical materials. Though not crowned by the Chinese emperors, the Japanese princes still paid tributes to China, making themselves quasi-subjects of the Chinese government. According to the Chinese worldview, the status of Japan during the Sui and Tang Dynasties was lower than the position of Korea, whose rulers were crowned by the Chinese authorities. Yet, in this way Japan was gaining more independence from Chinese influence, with her judicial system sophisticated.