The Longqing Emperor (simplified Chinese: 隆庆; traditional Chinese: 隆慶; pinyin: Lóngqìng; 4 March 1537 – 5 July 1572), personal name Zhu Zaiji (朱載坖), was the 13th Emperor of the Ming dynasty, reigned from 1567 to 1572. He was initially known as the Prince of Yu (裕王) from 1539 to 1567 before he became the emperor. His era name, Longqing, means "great celebration".