17th century. Nurhaci may have spent time in a Han household in his youth, and became fluent in Chinese and Mongolian languages, 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-ruled dynasty. Two years later, Nurhaci announced the "Seven Grievances" and openly renounced the sovereignty of Ming overlordship in order to complete the unification of those Jurchen tribes still allied with the Ming emperor. After a series of successful battles, he relocated his capital from Hetu Ala to successively bigger captured Ming cities in Liaodong: first Liaoyang in 1621, then Shenyang (Manchu: Mukden) in 1625. Furthermore, the Khorchin proved a useful ally in the war, lending the Jurchens their expertise as cavalry archers. To guarantee this new alliance, Nurhaci initiated a policy of inter-marriages between the Jurchen and Khorchin nobilities, while those who resisted were met with military action. This is a typical example of Nurhaci's initiatives that eventually became official Qing government policy. During most of the Qing period, the Mongols gave military assistance to the Manchus. Hong Taiji Nurhaci died in 1626, and was succeeded by his eighth son, Hong Taiji. Although Hong Taiji was an experienced leader and the commander of two Banners, the Jurchens suffered defeat in 1627, in part due to the Ming's newly acquired Portuguese cannons. To redress the technological and numerical disparity, Hong Taiji in 1634 created his own artillery corps from his existing Han troops, who cast their own cannons in the European design with the help of defector Chinese metallurgists. One of the defining events of Hong Taiji's reign was the official adoption of the name "Manchu" for the united Jurchen people in November 1635. In 1635, the Manchus' Mongol allies were fully incorporated into a separate Banner hierarchy under direct Manchu command. In April 1636, Mongol nobility of Inner Mongolia, Manchu nobility and the Han mandarin recommended that Hong as the khan of Later Jin should be the emperor of the Great Qing. When he was presented with the imperial seal of the Yuan dynasty after the defeat of the last Khagan of the Mongols,