Ли Цзычэн
At the same time, the Ming dynasty was fighting for its survival against fiscal turmoil and peasant rebellions. Han Chinese officials urged Nurhaci's successor Hong Taiji to crown himself Emperor of China, which he did in 1636, declaring the new Qing dynasty. On 24 April 1644, Beijing fell to a rebel army led by Li Zicheng, a former minor Ming official who became the leader of the peasant revolt, who then proclaimed the Shun dynasty. The last Ming emperor, the Chongzhen Emperor, hanged himself from a tree in the imperial garden outside the Forbidden City. When Li Zicheng moved against him, the Ming general Wu Sangui shifted his allegiance to the Qing. Li Zicheng was defeated at the Battle of Shanhai Pass by the joint forces of Wu Sangui and Manchu prince Dorgon. On 6 June, the mainly Han Chinese forces of Dorgon and Wu entered the capital.