Decades: 310s BC 300s BC 290s BC 280s BC 270s BC - **260s BC** - 250s BC 240s BC 230s BC 220s BC 210s BC

Years: 268 BC 267 BC 266 BC 265 BC 264 BC - **263 BC** - 262 BC 261 BC 260 BC 259 BC 258 BC

- First Punic War: The Roman consul Manius Valerius Messalla secures the alliance of Hiero II of Syracuse.
- Eumenes I succeeds his uncle Philetaerus as king of Pergamon.