Secundus the Silent (Ancient Greek: Σεκοῦνδος) (fl. 2nd century AD) was a philosopher who lived in Athens in the early 2nd century, who had taken a vow of silence. An anonymous text entitled Life of Secundus (Latin: Vita Secundi Philosophi) purports to give details of his life as well as answers to philosophical questions posed to him by the emperor Hadrian. The work enjoyed great popularity in the Middle Ages.
