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The civil war in between the Lê-Trịnh and Mạc dynasties led to 1592, when the military of Trịnh Tùng conquered Hanoi and executed king Mạc Máºu Hợp. Survivors from the Mạc royal family fled on the northern mountains during the province of Cao Bằng and continued to rule there until 1677 when Trịnh Tạc conquered this previous Máº