Centuries: 3rd century - 4th century - 5th century

Decades: 270s - 280s - 290s - 300s - 310s - 320s - 330s - 340s - 350s - 360s - 370s

Years: 320 321 322 323 324 325 326 327 328 329

Events:

• Constantine I of the Roman Empire starts legislating Christian beliefs into civil law. (eg: blue laws)