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
- Validity limit for the information on Western Roman Empire in the Notitia Dignitatum.da:420'erne
de:420er el:Δεκαετία 420 es:Años 420 fi:420-luku fr:Années 420 it:Anni 420 pt:Década de 420 ro:Anii 420 sl:420. uk:420-ті zh:420年代