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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 in the Mạc royal relatives fled to your northern mountains inside the province of Cao Bằng and continued to rule there until eventually 1677 when Trịnh Tạc conquered this