 The Liao dynasty ( Khitan : Mos Jælud ; simplified Chinese : 辽朝 ; traditional Chinese : 遼朝 ; pinyin : Liáo cháo ) , officially the Great Liao ( Chinese : 大遼 ; pinyin : Dà Liáo ) , also known as the Khitan Empire ( Khitan : Mos diau @-@ d kitai huldʒi gur ; Chinese : 契丹国 ; pinyin : Qìdān guó ) and the Liao Empire , was an empire in East Asia that ruled from 907 to 1125 over present @-@ day Mongolia and portions of the Russian Far East , northern Korea , and northern China . The Liao dynasty was founded by Abaoji , Khagan of the Khitan people around the time of the collapse of Tang China . It was the first state to control all of Manchuria . 
