What was to become the Manchu state was founded by Nurhaci, the chieftain of a minor Jurchen tribethe Aisin Gioroin Jianzhou in the early 17th century. Nurhaci may have spent time in a Chinese household in his youth, and became fluent in Chinese as well as Mongol, and read the Chinese novels Romance of the Three Kingdoms and Water Margin. Originally a vassal of the Ming emperors, Nurhaci embarked on an intertribal feud in 1582 that escalated into a campaign to unify the nearby tribes. By 1616, he had sufficiently consolidated Jianzhou so as to be able to proclaim himself Khan of the Great Jin in reference to the previous Jurchen dynasty.