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 with the Mạc royal loved ones fled towards the northern mountains while in the province of Cao Bằng and ongoing to rule there https://vi-t-nam87542.blogdomago.com/30213444/details-fiction-and-vf555