Tự Đức (Hanoi: [tɯ̂ ɗɯ́k], chữ Hán: 嗣德, lit. 'inheritance of virtues', 22 September 1829 – 19 July 1883) (personal name: Nguyễn Phúc Hồng Nhậm, also Nguyễn Phúc Thì) was the fourth emperor of the Nguyễn dynasty of Vietnam, and the country's last pre-colonial monarch. Ruling for about 36 years from 1847 to 1883, this made him the longest reigning Nguyễn emperor.
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