《旧唐书·本纪·卷二十》
六月初一，李克用的大将，暂署邢浚兵马留后安建奉上表章，请求以三个州归降朝廷，皇上派遣中使前去抚慰他。
六月乙卯，李克用大将权知邢洺兵马留后安建上表，请以三州归顺，遣中使往劳之。
On June 1, General Li Keyong’s subordinate, An Jian, who was temporarily serving as military commissioner of Xing Jun, handed in a memorial, requesting to submit three states to the Imperial Court. After that, the emperor sent a eunuch to comfort him.