The civil war amongst the Lê-Trịnh and Mạc dynasties resulted in 1592, when the military of Trịnh Tùng conquered Hanoi and executed king Mạc Mậu Hợp. Survivors of the Mạc royal family members fled to your northern mountains inside the province of Cao Bằng and continued to rule there right until 1677 when Trịnh Tạc conquered th… Read More