Trịnh Tùng, also known as Trịnh Tòng and later given the title Bình An Vương (平安王), was the de facto ruler of Đại Việt from 1572 to 1623. Trịnh Tùng is the first official Trịnh lord, although his father—Trịnh Kiểm—was de facto ruler of Dai Viet before him, Trịnh Kiểm never claimed himself as Trịnh lord. Therefore, Trịnh Kiểm is not considered as the first Trịnh lord.