Centuries: 6th century BC -

**5th century BC**- 4th century BC

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

Years: 427 BC 426 BC 425 BC 424 BC 423 BC - **422 BC** - 421 BC 420 BC 419 BC 418 BC 417 BC

**Events**

- Battle of Amphipolis: The Spartans under Brasidas defeat the Athenians under Cleon.

**Births**

**Deaths**