Nong Zhigao
Overview
Cao Bang Province
Cao Bằng is a province of northeastern Vietnam. The province has borders with Hà Giang, Tuyên Quang, Bắc Kạn, and Lạng Sơn provinces within Vietnam. It also has common international border with Guangxi province of the People's Republic of China...
). At that time, the Zhuang people were oppressed by Jiaozhi (now northern Vietnam), so Nong Zhigao presented many treasures to Northern Song asking to be a member of Northern Song.