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

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

- Antiochus II Theos, later King of the Seleucid dynasty.

- King Lysimachus of Thrace conquers Macedon and declares himself its King.