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The civil war between the Lê-Trịnh and Mạc dynasties resulted in 1592, when the military of Trịnh Tùng conquered Hanoi and executed king Mạc Mậu Hợp. Survivors of the Mạc royal spouse and children fled on the northern mountains in the province of Cao Bằng and continued to rule there until 1677 when Trịnh Tạc conquered this pas