 It is also sometimes called the "Jurchen dynasty" or the "Jurchen Jin", because its founding leader Aguda (reigned 1115–1123) was of Wanyan Jurchen descent.The Jin emerged from Taizu's rebellion against the Liao dynasty (916–1125), which held sway over northern China until the nascent Jin drove the Liao to the Western Regions, where they became known as the Western Liao.After vanquishing the Liao, the Jurchen Jin launched a century-long campaign against the Chinese Song dynasty (960–1279), which was based in southern China.