Lê Chiêu Thống
In 1786, the Tây Sơn general Nguyễn Huệ led his force to northern Vietnam and destroyed the house of the Trịnh lords. The next year, 1787, the Lê emperor Lê Hiển Tông died of natural causes, and Nguyễn Huệ installed Lê Duy Khiêm on the throne as emperor Lê Chiêu Thống and then he withdrew almost all his troops to Phú Xuân. Trịnh Lords members took advantage of Nguyễn Huệ's absence. Two Trinh heirs, Trịnh Bồng and Trịnh Lệ, appeared and made their claims to the lord throne. emperor Lê Chiêu Thống appointed Trinh Bong as the next Trịnh lord which triggered Trịnh Lệ to revolt. After suppressing Trịnh Lệ forces, Trịnh Bồng became the most powerful man in north Vietnam but his leadership was bad. The entirety of north Vietnam sank into chaos, thus forcing King Lê Chiêu Thống to ask for assistance from Nguyễn Hữu Chỉnh, Tây Sơn governor of Nghệ An. Nguyen Huu Chinh led an army marched north, easily defeated Trinh army, forced Trinh Bong to flee and captured Thăng Long. After pacifying the region, Nguyen Huu Chinh abused power for his own interests, thus impinging Nguyễn Huệ's political status.