Decades: 280s BC 270s BC 260s BC 250s BC 240s BC - **230s BC** - 220s BC 210s BC 200s BC 190s BC 180s BC

Years: 244 BC 243 BC 242 BC 241 BC 240 BC - **239 BC** - 238 BC 237 BC 236 BC 235 BC 234 BC

- Diodotus of Bactria defeats a combined army of Parthians and troops led by Seleucus II Callinicus.
- First recorded passage of Halley's Comet.

- Approximate year of birth for Ennius