Cobra

Ngưu Hống was a Black Tai kingdom in the Black River valley. In 1337 a Đại Việt army stormed the Trịnh Kỳ stockade, killed its chief and secured its submission.

The Ming subjugated the Black Tai lands in 1416. After the Lam Sơn uprising, Lê Lợi campaigned there in 1431 and 1432, incorporating the lands into Đại Việt’s Hưng Hóa province. In the 15th century, the number of villages in Gia Hưng grew fivefold.