The Eight Banners were administrative and military divisions under the Later Jin and Qing dynasties of China into which all Manchu households were placed. In war, the Eight Banners functioned as armies, but the banner system was also the basic organizational framework of all of Manchu society. Created in the early 17th century by Nurhaci, the banner armies played an instrumental role in his unification of the fragmented Jurchen people and in the Qing dynasty's conquest of the Ming dynasty.