Khải Định
Emperor Khải Định had his first and only son with one of his concubines, Hoàng Thị Cúc (1890-1980). She gave birth to Nguyễn Phúc Vĩnh Thụy (later Emperor Bảo Đại) in 1913. After Khải Định's ascension, she was given the title of Huệ tần, noble consort of the third rank, later elevated to the title Huệ phi, noble consort of the second rank.