A Chinese dynasty (AD 1115-1234) founded by the Jurchen tribes of Manchuria, who were formerly vassals of the Khitans or Liao dynasty (AD 916-1125). They overran most of northern China and captured the Sung capital of K'ai-feng, forcing the Chinese to move their capital south to Hang-chou in 1126. The empire covered much of Inner Asia and all of North China.