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The civil war among 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 to your northern mountains from the province of Cao Bằng and continued to rule there right up until 1677 when Trịnh Tạc conquered