The civil war concerning the Lê-Trịnh and Mạc dynasties resulted in 1592, when the army of Trịnh Tùng conquered Hanoi and executed king Mạc Mậu Hợp. Survivors of the Mạc royal family fled to your northern mountains inside the province of Cao Bằng and continued to rule there until 1677 https://eddiee074qwc8.wikiusnews.com/user