Nguyễn Hoàng
He was the second son of Nguyễn Kim. When his father was assassinated by a Mạc supporter, his brother-in-law Trịnh Kiểm took command of the Lê royalist army. Sometime after his older brother (Nguyễn Uông) died (believed to have been poisoned), Nguyễn Hoàng requested his brother in law, and was appointed to govern the southernmost province of Vietnam. This land was formerly Champa territory which had been conquered by emperor Lê Thánh Tông and at the time was under control of Mạc force. Nguyễn Hoàng defeated the enemy commander Duke Lập and took over the province in 1558. In 1573 he was given the title Grand Master (Thai-pho) by Emperor Le The Ton. Later he was given the title Duke of Mon (Mon Cong).