The Liao dynasty (; Khitan: "Mos Jælud"; ), also known as the Liao Empire, officially the Great Liao (), or the Khitan (Qidan) State (Khitan: "Mos diau-d kitai huldʒi gur"), was an empire and imperial dynasty in East Asia that ruled from 916 to 1125 over present-day Northern and Northeast China, Mongolia and portions of the Russian Far East and North Korea. The empire was founded by Yelü Abaoji (Emperor Taizu of Liao), Khagan of the Khitans around the time of the collapse of the Tang dynasty and was the first state to control all of Manchuria. The Liao dynasty was ruled by the Khitan Yelü clan.