arius III. Darius III, also called Codommanus, (died 330 bc, Bactria), the last king (reigned 336–330 bc) of the Achaemenid dynasty. Darius belonged to a collateral branch of the royal family and was placed on the throne by the eunuch Bagoas, who had poisoned the two previous kings, Artaxerxes III and Arses.
