佛祖歷代通載 19.71

19.71

（壬寅）　遼延禧與女真大戰（而敗。上京東京陷。徙燕。女真又攻敗之。延禧與二子奔于不毛之地。由洛陽入夾山。復立于燕。遼由是分矣。改元建福）。

(Ren-yin [1122]) Emperor Yanxi of Liao fought a great battle with the Jurchens (and was defeated. The Upper Capital and Eastern Capital fell. He moved to Yan, but the Jurchens attacked and defeated him again. Yanxi and his two sons fled to a barren wasteland. From Luoyang he entered the Jia Mountains, and again established his rule in Yan. From this the Liao was divided, and changed its era name to Jianfu).