Quảng Uyên

Quảng Uyên lies among the mountains of the northeastern frontier, in the old country of Quảng Nguyên. Its valleys were home to Tày and Nùng communities whose local rulers held power between Đại Việt and Song China. In the eleventh century the Nùng leader Nùng Trí Cao rose to prominence here. The region later saw fierce fighting during the Song invasion of Đại Việt, as local forces resisted the advance through Quảng Nguyên.