Tai peoples
Tai peoples have settled in the northwestern parts of what now is Vietnam since the early first millennium CE or, at the latest, the 5th to 8th century. They mainly settled along the Black River "(Sông Đà)". One Black Tai chiefdom—located at the place today known as Điện Biên Phủ—was named "Muang Thaeng", just like the legendary kingdom of Khun Borom, protagonist of a Tai creation myth and believed to be the progenitor of the Lao, Thai, Shan and other Tai peoples, who later spread to the territories of modern Laos, Thailand, Burma, northeast India and the south of China's Yunnan province.