Trịnh Kiểm
Trịnh Kiểm (1503–1570) ruled northern part of Vietnam from 1545 to 1570. Trịnh Kiểm was the founder of the Trịnh Lords or House of Trịnh who ruled Dai Viet while a succession of figurehead Later Lê Emperors took the role as puppet government. During his rule, the war with the Mạc Dynasty continued. Although he was the de facto ruler of Dai Viet during his reign, he never claimed himself title of Lord, hence he is not the first official Trịnh Lord but his son Trịnh Tùng is the first. Later Trịnh Kiểm was posthumously proclaimed Trịnh Lord by his descendants.