420s

Centuries: 4th century - 5th century - 6th century

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

Years: 420 421 422 423 424 425 426 427 428 429

Events:

• Saint Augustine of Hippo publishes The City of God