Main Page | See live article | Alphabetical index 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 Events 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 Births Deaths This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.