Decades: 330s BC 320s BC 310s BC 300s BC 290s BC - **280s BC** - 270s BC 260s BC 250s BC 240s BC 230s BC

290 BC 289 BC 288 BC 287 BC 286 BC **285 BC** 284 BC 283 BC 282 BC 281 BC 280 BC

- Demetrius surrenders to Seleucus I Nicator.
- Battle of Arretium: A Roman army under Lucius Caecilius is destroyed by the Gauls