契丹族首领耶律阿保机在916年称天皇帝,国号“契丹”,改名耶律亿。918年定都臨潢
府(今内蒙古乌达盟巴林左旗南波罗城)。936年-947年之间改国号大辽[1],983年复
更名“契丹”,1066年恢复国号“大辽”[2],直到1125年辽为金所灭。1122年金朝攻
打,天祚帝出逃夹山,耶律淳被立为皇帝,史称北辽[2]。遼亡後,耶律大石西迁到中
亚楚河流域,于1132年建立西遼。1211年,被屈出律篡位。1218年,被大蒙古國所滅。
The Liao Empire was destroyed by the Jurchen of the Jin Dynasty in 1125.
However, remnants of its people led by Yelü Dashi established Xi (Western)
Liao Dynasty 1125-1220, also known as Kara-Khitan Khanate, which extended
its influence over Central Asia into Persia and survived until the arrival
of Genghis Khan's unified Mongolian army.