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

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

Years: 316 317 318 319 320 - 321 - 322 323 324 325 326

• Publication of the first blue law by Constantine I of the Roman Empire: trade is forbidden on Sundays; agriculture is allowed
• The Roman Catholic church is allowed to hold property