鄭檢
After the death of his mother, he joined the army of the revived Lê dynasty led by Nguyễn Kim. Because of Trịnh Kiểm's talent, he was given the hand of Kim's daughter Ngọc Bảo, and became his son-in-law. In 1539, Trịnh Kiểm was promoted to general and received the title of Duke of Dực (Dực quận công). In 1545, after the assassination of Nguyễn Kim, Trịnh Kiểm replaced his father-in-law as the commander of the Lê dynasty's royal court and military.