Decades: 470s BC 460s BC 450s BC 440s BC 430s BC - **420s BC** - 410s BC 400s BC 390s BC 380s BC 370s BC

Years: 432 BC 431 BC 430 BC 429 BC 428 BC - **427 BC** - 426 BC 425 BC 424 BC 423 BC 422 BC

- Plato, Greek philosopher

- Archidamus II, king of Sparta