Trịnh Tùng
With the death of Trịnh Tùng in 1623 and the new rule of his son, Trịnh Tráng, another formal demand was made by the Court in Hanoi for the Nguyễn to pay tribute. In 1624, Nguyen Phuc Nugyen formally refused. Three years later, the Royal (Trịnh) army marched south and attacked the Nguyễn.