同慶帝
Dục Đức was born Nguyễn Phúc Ưng Ái and at age 17 was renamed Nguyễn Phúc Ưng Chân (阮福膺禛). He was the second son of Nguyễn Phúc Hồng Y, the fourth brother of Emperor Tự Đức. He and his two cousins, Chanh Mong (later Emperor Đồng Khánh) and Duong Thien (Kiến Phúc), sons of Tự Đức's twenty-sixth brother Thien Thai Vuong, were adopted by the emperor, who had no children of his own.