《辽史·本纪·卷二十六》
十一月初一，知右夷离毕事萧药师奴、枢密直学士耶律俨出使宋国，劝谕宋人与夏讲和。
十一月乙巳朔，知右夷离毕事萧药师奴、枢密直学士耶律俨使宋，讽与夏和。
On 1st November, the manager of Youyili affairs Xiao Yaoshi Nu, and the direct scholar of Huben College Yelu Yan were sent to Song State, trying to persuade Song people to make peace with Xia.