The Yongli Emperor (Chinese: 永曆; 1623–1662; reigned 18 November 1646 – 1 June 1662), personal name Zhu Youlang, was the fourth and last emperor of the Southern Ming dynasty of China. His era name means "Perpetual calendar". Zhu Youlang was the son of Zhu Changying (朱常瀛), the seventh son of the Wanli Emperor. He inherited the title Prince of Gui (桂王) from his brother and lived an obscure life as a minor member of the extremely large imperial family until the fall of Beijing and the suicide of Chongzhen, the last Ming emperor, in 1644. The true beneficiaries of the collapse of the Ming were the Manchus, a northeastern people that rapidly conquered northern China, the Lower Yangtze valley, and Central China. Descendants of the Ming continued to hang on in the south, and Youlang ascended the throne as the fourth Southern Ming emperor, with the reign-title Yongli in November 1646. Then he converted to Christianity thanks to the efforts of Jesuit Michał Boym. By 1661, pressed back into Yunnan province, he fled to Burma. A Manchu army followed and captured him there, and he was executed in June 1662.