李自成
Also in 1629, Li Zicheng launched a peasant rebellion in northwest China and, after 15 years of conquest, captured Beijing in March 1644. The Chongzhen Emperor committed suicide by hanging himself from a tree in Jingshan. Li proclaimed himself emperor of the Shun dynasty, but he was defeated at Shanhaiguan by Ming general Wu Sangui and the Manchu Prince Dorgon. Wu had defected to the Manchus and allowed them inside the Great Wall. They drove Li Zicheng from Beijing in late April.