Decades: 390s BC 380s BC 370s BC 360s BC 350s BC - **340s BC** - 330s BC 320s BC 310s BC 300s BC 290s BC

349 BC 348 BC 347 BC 346 BC 345 BC - **344 BC** - 343 BC 342 BC 341 BC 340 BC 339 BC

- Aristotle, a student of Plato, investigates natural history (especially marine biology) on the island of Lesbos.
- Plato moves from Assus to Mitylene.
- Eastern Anatolia separates from Persia.
- Dionysius, Tyrant of Syracuse goes into exile after an invasion by Timoleon of Corinth.
- Battle of Granciu.

- Larissa Thessaly