The Trịnh–Nguyễn Civil War divided Vietnam between two ruling lords for over a century, establishing the Gianh River as a de facto national border.
Key Facts
- War began
- 1627
- Conflict period
- 17th–18th centuries
- De facto border
- Gianh River
- Northern territory
- Đàng Ngoài (Trịnh lords)
- Southern territory
- Đàng Trong (Nguyễn lords)
- Nguyễn collapse in Saigon
- 1777
By the Numbers
Location
Cause → Event → Consequence
Vietnam in the 17th century was nominally ruled by the Lê dynasty but effectively controlled by rival regent clans. The Trịnh lords dominated the north while the Nguyễn lords consolidated power in the south, and tensions over authority and territory eventually led to open armed conflict beginning in 1627.
The Trịnh–Nguyễn Civil War was a prolonged military and political struggle between the Trịnh lords of Đàng Ngoài in the north and the Nguyễn lords of Đàng Trong in the south. Fighting produced a long stalemate, with the Gianh River serving as the de facto boundary dividing the two sides during periods of peace.
After roughly a century of stalemate and relative peace, conflicts resumed in 1774. The renewed fighting led to the rise of the Tây Sơn forces, who defeated the Nguyễn lords; the Nguyễn collapsed in Saigon in 1777, fundamentally reshaping the political order of Vietnam.
Belligerents & Mobilization Analysis
Side A
1 belligerent
Side B
1 belligerent