Trịnh Tùng
In 1600, the first Nguyễn Lord, Nguyễn Hoàng, refused to acknowledge the authority of the Trịnh-dominated court in Hanoi. With the death of Trịnh Tùng, the current Nguyễn Lord, Nguyễn Phúc Nguyên refused to send any taxes or soldiers to the court. After years of rising tension, Trịnh Tráng went to war against the Nguyễn.