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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 with the Mạc royal spouse and children fled into the northern mountains within the province of Cao Bằng and ongoing to rule there until eventually 1677 when Trịnh Tạc co