《元史·列传·卷九十七》
暹国在成宗元贞元年，向元朝进金字表，要求朝廷派使臣去暹国。
暹暹国，当成宗元贞元年，进金字表，欲朝廷遣使至其国。
In the first year of Yuanzheng, King Chengzong of Siam presented the Yuan Dynasty with a gold tablet requesting the court to send emissaries to Siam.