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Ctesias, who lived in the fifth century BC, was physician to the Achaemenid king Artaxerxes II, whom he accompanied in 401 BC on his expedition against his brother Cyrus the Younger. Ctesias was part of the entourage of King Artaxerxes at the Battle of Cunaxa (401 BC) against Cyrus the Younger and his Greek mercenaries called the Ten Thousand, and brought medical assistance to the king by treating his flesh wound. He reportedly was involved in negotiations with the Greeks after the battle, and also helped their Spartan general Clearchus before his execution at the royal court at Babylon.