Trịnh–Nguyễn War
Nguyễn Phúc Thái was also known as Nguyễn Phước Trăn, courtesy name Ngạn (). He was the second son of lord Nguyễn Phúc Tần. Nguyễn Phúc Thái took the title "Hoằng Quốc-công" ( ; National Duke of Hoằng, different from Quận-công as Local Duke). With the end of the Trịnh–Nguyễn War, not much of note happened during Nguyễn Phúc Thái's rule. It is reported that he needed to put down an uprising by Chinese immigrants who had settled in Saigon.