The Liao dynasty was a Khitan-led dynasty of China that ruled over parts of Northern China, Manchuria, the Mongolian Plateau, northern Korean Peninsula, and what is modern-day Russian Far East from 916 until 1125 when it was conquered by the Jin dynasty. Remnants of the Liao court fled westward and created the Western Liao dynasty which in turn was annexed by the Mongol Empire in 1218. Liao coinage is extremely rare compared to Song dynasty coinage. While the Song dynasty produced millions of strings of wén annually, the Khitans never exceeded 500.