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The civil war concerning the Lê-Trịnh and Mạc dynasties led to 1592, when the military of Trịnh Tùng conquered Hanoi and executed king Mạc Mậu Hợp. Survivors with the Mạc royal spouse and children fled to the northern mountains within the province of Cao Bằng and continued to rule there right until 1677 when Trịnh Tạc conquere