Panaetius (Panaitios) of Tenos, the son of Sosimenes. He commanded a vessel of the Tenians which accompanied the armament of Xerxes in his invasion of Greece, but apparently by compulsion; for just before the battle of Salamis, Panaetius with his ship deserted and joined the Greeks, fortunately just in time to confirm the intelligence of the movements of the Persian fleet which had been brought by Aristides, but which the Greeks at first could hardly believe. On account of this service the Tenians were recorded on the tripod set up at Delphi amongst those who had aided in destroying the forces of the barbarians. (Herod. viii. 81 ; Plut. Themist. p. 118. e.).