THE BASIC PRINCIPLES OF GK88

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 of the Mạc royal family fled into the northern mountains while in the province of Cao Bằng and continued to rule there right until 1677 when Trịnh Tạc conquered this past