The civil war between the Lê-Trịnh and Mạc dynasties resulted in 1592, when the army of Trịnh Tùng conquered Hanoi and executed king Mạc Mậu Hợp. Survivors on the Mạc royal household fled for the northern mountains during the province of Cao Bằng and continued to rule there till 1677 https://juniusi307zgl2.digitollblog.com/profile