啟定帝
After the deportation and exile of the Emperors Thành Thái and Duy Tân, the new pro-French puppet king Khải Định chose to change the imperial flag, replacing the three strips which signified the three regions of Vietnam (North, Central, and South) with a single horizontal band of red. Formally known as the "", the flag was the official flag of the Nguyễn Court.