The civil war involving the Lê-Trịnh and Mạc dynasties resulted in 1592, when the army of Trịnh Tùng conquered Hanoi and executed king Mạc Mậu Hợp. Survivors from the Mạc royal family members fled for the northern mountains while in the province of Cao Bằng and ongoing to rule there https://vf55500875.blogstival.com/53281803/the-greatest-guide-to-gk88