ウェブCtesias ( / ˈtiːʒəs /; Greek: Κτησίᾱς; fl. fifth century BC), also known as Ctesias of Cnidus, was a Greek physician and historian from the town of Cnidus in Caria, then part of the Achaemenid Empire . Historical events. Ctesias was on the Achaemenid side, attending to Artaxerxes II, at the Battle of Cunaxa (401 BC), Jean Adrien Guignet.