A minority ethnic group living mostly in the highlands abutting the southeastern jungles of the Earth Kingdom. They are known for their textile arts and silversmithing, and grow rice in hillside terraces. The Mau Dai rose up against a brutal provincial governor around 40 BG, and fought a brief and bloody war against the Hou-Ting dynasty before the Avatar Roku persuaded the opposing sides to accept a negotiated peace. The Mau Dai resumed sending taxes and tribute to the capital, but thereafter would be governed by an ethnic Mau Dai civil official rather than an outsider.