Ctesias

Ctesias of Cnidus ( /ˈtiːʒəs/; Ancient Greek: Κτησίας) was a Greek physician and historian from Cnidus in Caria. Ctesias, who lived in the 5th century BC, was physician to Artaxerxes Mnemon, whom he accompanied in 401 BC on his expedition against his brother Cyrus the Younger.