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

Years: 240 BC 239 BC 238 BC 237 BC 236 BC - **235 BC** - 234 BC 233 BC 232 BC 231 BC 230 BC

- In Rome, the consul Titus Manlius Torquatus presides over the first closing of the gates of the Temple of Janus, signifying peace.
- Cleomenes III becomes king of Sparta.
- Megalopolis joins the Achaean League.