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

Years: 235 BC 234 BC 233 BC 232 BC 231 BC - **230 BC** - 229 BC 228 BC 227 BC 226 BC 225 BC

- Sieve of Eratosthenes developed.
- The Roman Lucius Coruncanius is assaulted and killed while on a diplomatic mission to Queen Teuta, an event leading to the First Illyrian War.
- Temple of Horus built by Ptolemy III of Egypt.
- Hasdrubal succeeds his father-in-law Hamilcar Barca, who had been slain in battle, as ruler of Carthaginian Spain.
- State of Qin conquered the state of Han in China.

- Aristarchus of Samos, Greek philosopher, astronomer, mathematician
- Asoka, Emperor of India
- Hamilcar Barca, commander of Carthaginian army
- Lucius Coruncanius