Zong Bi attacked Song and crossed the Huai River, then by letter agreed that the Huai would be the boundary. (History of Jin (Jinshi), Annals 金史 卷004 熙宗 皇統元年9月)
Xiao Yi and others were received in audience, and only then were the peace and the oath settled. (History of Song (Songshi), Annals 宋史卷029 紹興十一年)
Yi Yang-sil, the Commissioner of Myeongju, sends men to Ulleung Island and collects strange fruits and leaves, presenting them to the court. (Goryeosa (History of Goryeo) 世家 卷17 仁宗 十九年)