Trịnh Tráng
Nguyễn Phúc Lan was the second son of Nguyễn Phúc Nguyên. His father died in the midst of the war by Trịnh Tráng to conquer the southern provinces. Unwilling to make peace, Nguyễn Phúc Lan continued his father's policies of maintaining a strong defensive position on the great walls while continuing friendly relations with the Portuguese and expanding south into Cambodian and Champa territory. Following after his grandfather, he took the title of Vuong (Prince/Lord), calling himself "Cong-Thuong Vuong".