Sidon, the centre of the revolt against Persia, asks for help from its sister city of Tyre and from Egypt but gets very little.
Idrieus, the second son of Hecatomnus, succeeds to the throne of Caria on the death of Artemisia II, the widow of his elder brother Mausolus. Shortly after he becomes ruler, at the request of the Persian king, Artaxerxes III, Idrieus equips a fleet of 40 triremes and an army of 8,000 mercenary troops and despatches them against Cyprus, under the command of the Athenian general Phocion.
Plato proposes a geocentric model of the universe with the stars rotating on a fixed celestial sphere.
Art
Praxiteles makes the Aphrodite of Knidos (approximate date). A composite of two similar Roman copies after the original marble is now kept at Musei Vaticani, Museo Pio Clementino, Gabinetto delle Maschere in Rome.