310 BC

Year 310 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Rullianus and Censorinus (or, less frequently, year 444 Ab urbe condita). The denomination 310 BC for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

Greece/Macedonia

 * Antigonid general Ptolemy forms an alliance with Cassander revolting against his uncle Antigonus

Cyprus

 * By order of Ptolemy, Nicocles of Paphos kills himself.

Babylonia

 * Antigonus orders Nicanor, one of his generals, to invade Babylonia from the east and his son Demetrius Poliorcetes to attack it from the west. Nicanor assembles a large force but is surprised and defeated by Seleucus at the river Tigris, and his troops are either cut to pieces or defect to the enemy. Similarly, Demetrius Poliorcetes fails to oust Seleucus.

Asia Minor

 * Ptolemy attacks Cilicia, territory held by Antigonus.
 * The cities of Antigonia Troas (later known as Alexandria Troas) and Antigoneia (later known as Nicaea) are founded by Antigonus I Monophthalmus.

Sicily and Africa

 * The tyrant of Syracuse, Agathocles, escapes from the siege of the city by the Carthaginians with a fleet and carries the war with the Carthaginians back into his enemy's territory. He defeats the Carthaginians in the Battle of White Tunis.

Roman Republic

 * Rome deals with renewed trouble from the Etruscans, who are persuaded by the Samnites to cease their alliance with the Romans. In the Battle of Lake Vadimo, the Romans under Fabius Maximus Rullianus defeat the Etruscans.

Illyria

 * The Autariatae disappear due to Celtic migrations.

Births

 * Aristarchus of Samos, Greek astronomer and mathematician (approximate date) (d. c. 230 BC)
 * Huiwen of Zhao, Chinese king of Zhao (Warring States Period) (d. 266 BC)
 * Xun Zi, Chinese philosopher (approximate date) (d. c. 230 BC)

Deaths

 * Roxana, Bactrian or Sogdian princess, widow of Alexander the Great
 * Pytheas, Greek merchant, geographer and explorer from the Greek colony Massilia (today Marseille) (b. c. 380 BC)
 * Nicocles (Paphos) king of Paphos