鄭主
The Trịnh–Nguyễn Civil War () was a 17th century lengthy civil war waged between the two ruling families in Vietnam, the Trịnh lords of Tonkin and the Nguyễn lords, centered in today's Central Vietnam. The wars resulted in a long stalemate and century of peace before conflicts resumed in 1774 resulting in the emergence of the Tây Sơn dynasty.