鄭檢
The founder of the clan was Trịnh Kiểm, born in Vĩnh Lộc commune, Thanh Hóa province. Trịnh Kiểm was raised in a poor family. He often stole chickens from his neighbors because chicken was his mother's favorite food. When his neighbors found out, they were extremely angry. One day, when Trịnh Kiểm left home, his neighbors abducted his mother and threw her down an abyss. Trịnh Kiểm returned home and panicked due to the disappearance of his mother. When he finally found his mother's body, it was infested with maggots.