321

Centuries - Year in Review 3rd Century - Year in Review 4th Century

3rd century - 4th century - 5th century

Decades:300s,310s,320s,330s,340s,350s?,360s,370s?,380s,390s

320? 321 322? 323? 324 325 326? 327? 328? 329

320? 321 322? - decade: 320s - 4th century

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Events:

• publication of the first blue law by Constantine