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: 319 320 321 322 323 - 324 - 325 326 327 328 329 Events Constantine becomes the sole emperor of the Roman Empire. End of the Tetrarchy as the Roman mode of government. St Peter's Church, Rome, founded. Eustathius becomes bishop of Antioch Births Deaths December 20 - Philogonus, Patriarch of Antioch Licinius, former Roman Emperor, executed for treason\n This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.