Tôn Thất Thuyết
The last independent Nguyễn emperor was Tự Đức. A succession crisis followed his death, as the regent Tôn Thất Thuyết orchestrated the murders of three emperors in a year. This allowed the French to take control of the country and its monarchy. All emperors after Đồng Khánh were chosen by the French, and only ruled symbolically.