309 BC

Centuries: 5th century BC - 4th century BC - 3rd century BC

Decades: 350s BC 340s BC 330s BC 320s BC 310s BC 300s BC 290s BC 280s BC 270s BC 260s BC 250s BC

314 BC 313 BC 312 BC 311 BC 310 BC 309 BC 308 BC 307 BC 306 BC 305 BC 304 BC

Events
* It is possibly in this year (or else the year before), that King Alexander IV of Macedon and his mother Roxane is murdered under orders of his Regent Cassander.
*The Babylonian War between Antigonus and Seleucus ends with the victory of Seleucus, who repels Antigonus's attempt to regain the city. A peace treaty is probably agreed on. Antigonus returns to the west, while Seleucus turns east to consolidate his control over the eastern portions of Alexander the Great's empire.
* Ptolemy I Soter uses his fleet to sail to Greece, where he establishes his control over the Nesiotic Confederation of Aegean cities, founded by his rival Antigonus. Ptolemy also conquers Cyprus.
* Antigonus attempts to renew his alliance with the Macedonian general and former regent Polyperchon, who still controls part of the Peloponnesus. He sends to Polyperchon Heracles, the illegitimate son of Alexander the Great, as a pretender to the throne of Macedon. Polyperchon soon changes sides, however, defecting to Cassander and murdering Heracles and his mother Barsine.
* Areus I succeeds his grandfather Cleomenes II as king of Sparta
* Romans under L. Papirius Cursor won a great victory over the Samnites in the Second Samnite War

Births
* Ptolemy II Philadelphus, King of Ancient Egypt

Deaths
* Roxana, wife of Alexander the Great, and mother of Alexander IV of Macedon.
* King Alexander IV of Macedon.
* Heracles, illegitimate son of Alexander the Great and claimant to the throne of Macedon.
* Cleomenes II, King of Sparta