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The civil war in between 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 household fled to your northern mountains while in the province of Cao Bằng and continued to rule there until finally 1677 when Trịnh Tạc conquered this