Li Zicheng
In 1644, he entered and conquered Beijing.He enthroned in Beijing and became the Emperor of the Shun Dynasty.His dynasty didn't last a long time. In May 27 the same year, Manchu regent Dorgon defeated Uprising leader Li Zicheng of the Shun Dynasty at the Battle of Shanhai Pass, allowing the Manchus to enter and conquer Beijing. Li died in 1645, aged 39.