According to the section of 'the Record of Eastern Barbarians, the Record of Wakoku (Japan)' in "Suishu" (the Book of the Sui Dynasty), the beginning of the official message of the king of Wa written to Yang Guang, the emperor of Sui, was as follows.
倭王から隋皇帝煬帝（ようだい）に宛てた国書が、『隋書』「東夷傳俀國傳」に以下のように書き出されていた。