The Rau people (Zhuang: Bouxraeuz), also known as Lao (Chinese: 僚人; pinyin: Lǎorén; Lao: ລາວ), were an ethnic group of ancient China. Their descendants are the Zhuang, Buyei, Tay–Nùng and other Kra–Dai-speaking peoples. Source: Wikipedia (en)