Centuries: 5th century BC -

**4th century BC**- 3rd century BC

Decades: 360s BC 350s BC 340s BC 330s BC 320s BC **310s BC** 300s BC 290s BC 280s BC 270s BC 260s BC

Years: 315 BC 314 BC 313 BC 312 BC 311 BC - **310 BC** - 309 BC 308 BC 307 BC 306 BC 305 BC

**Events**

- Battle of Lake Vadimo: The Romans defeat the Etruscans.
- Macedonian king Antigonus founded Antigonea, later known as Nicaea and Iznik (approximate year)
- Agathocles, tyrant of Syracuse, leads a counterstrike against Carthage
- Antigonia Troas (later known as Alexandria Troas) and Antigoneia (later known as Nicaea) are founded by Antigonus I of Macedon

**Births**

- Aratus, Macedonian Greek mathematician, astronomer, meteorologist, botanist and poet (possibly born in 315 BC)
- Aristarchus, Greek astronomer and mathematician

**Deaths**

- Kidinnu, Babylonian astronomer (approximate year).
- Heraclitus of Heraclea
- Pytheas, Greek merchant, geographer and explorer