In 631, Wakoku deployed an envoy to pay tributes to the King of Tang, but Taiso (Tang tai zong, the second Emperor of Tang) said to the office in charge that as Wakoku is located far from there, it does not need to pay tributes every year'.
貞観5年（631年）に倭国は使者を派遣して、入貢し方物を献じたが、太宗は、倭国は遠い国であるから、毎年朝貢する必要はない、と担当の役所に命じた、という。