李自成
When Li Zicheng and his army reached Beijing, he had made an offer via the former Ming eunuch Du Xun to the Chongzhen Emperor of the Ming dynasty that Li Zicheng would fight the Qing dynasty and eradicate all other rebels on behalf of the Ming, if the Ming dynasty would recognize Li Zicheng's control over his Shaanxi-Shanxi fief, pay him 1 million taels and confirm Li Zicheng's noble rank of Prince. Li Zicheng did not intend to overthrow the Ming Emperor or kill him. The Ming Emperor, however, fearful that accepting such political expediency would ruin his reputation tried to get Wei Zaode (魏藻德), the Chief Grand Secretary, to agree with the decision and shoulder the responsibility of the decision. Wei Zaode refused to answer, so the Chongzhen Emperor rejected Li Zicheng's terms. Li Zicheng marched into the capital as Ming officials surrendered and defected. Li Zicheng still did not intend to kill the Chongzhen Emperor and the Ming Crown Prince, intending to recognise them as nobles of the new Shun dynasty. Li Zicheng lamented the death of the Chongzhen Emperor after discovering he committed suicide, saying that he had come to share power and rule together with him. Li Zicheng distrusted the Ming officials who defected to his side when the Ming fell, viewing them as the reason for the Ming demise. After declaring his own Shun dynasty in Beijing, Li Zicheng sent an offer to the powerful Ming General at the Great Wall, Wu Sangui, to defect to his side in exchange for a high noble rank and title. Wu Sangui dallied for days before he decided to accept the rank and defect to Li Zicheng. Wu Sangui was on his way to formally capitulate and defect to Li Zicheng, but by that time Li Zicheng thought Wu Sangui's silence meant he had rejected the offer and ordered Wu Sangui's father to be beheaded. This caused Wu Sangui to defect to the Qing.