Centuries: 3rd century BC - 2nd century BC - 1st century BC
- Rome declares war upon Antiochus III the Great, king of Syria.
- Battle of Mutina: Romans are victorious over the Gauls.
- In the Battle of Gythium, Philopoemen of the Achaean League, assisted by the Romans, defeats the Spartans under Nabis.
- Puteoli becomes a Roman colony.
- Eratosthenes, Greek mathematician and astronomer