《隋书·列传·卷四十七》
隋炀帝大业十二年，真腊国王派使者向隋朝进贡，隋炀帝盛情款待，此后再没有向隋朝进贡。
大业十二年，遣使贡献，帝礼之甚厚，其后亦绝。
In the twelfth year of Emperor Yang of the Sui Dynasty, King Zhenla sent envoys to pay tribute to the Sui Dynasty, and Emperor Yang of Sui treated them with great hospitality. After that, he never paid tribute to the Sui Dynasty again.