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After the deportation and exile of the Emperors Thành Thái and Duy Tân, the new pro-French ruler 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 " Long Tinh ", the flag was the official flag of the Nguyễn Court.

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