Over two centuries after the removal of the capital to Beijing, Nanjing was destined to become the capital of a Ming emperor one more time. After the fall of Beijing to Li Zicheng's rebel forces and then to the Manchu-led Qing dynasty in the spring of 1644, the Ming prince Zhu Yousong was enthroned in Nanjing in June 1644 as <answer>the Hongguang Emperor</answer>. His short reign was described by later historians as the first reign of the so-called Southern Ming dynasty.
What was Zhu Yousong's title?
the Hongguang Emperor