Re: Event of the Year
 

353

Constantius II sends Paulus Catena to route out supporters of Magnentius in Roman Britain.

Re: Event of the Year
 

352

The Alamanni and the Franks defeat the Roman army, taking control of 40 towns between the Moselle and the Rhine.

Re: Event of the Year
 

351

In India, a new process makes possible the extraction of sugar from sugar cane.

Re: Event of the Year
 

350

Founding of the city of Anbar in Iraq

It continued to be a place of much importance throughout the Abbasid period, but now it is entirely deserted, occupied only by ruin mounds. The great number of these indicates the former importance of the city.

Re: Event of the Year
 

349

The Mou-jong (proto-mongols) take control of the North of China.

Re: Event of the Year
 

348

In Persia, women are enrolled in the army to perform auxiliary services

Re: Event of the Year
 

347

Council of Philippopolis is held as the was a result of Eastern bishops leaving the Council of Sardica. In Philippopolis, they excommunicated Pope Julius, and as a result, the Arian controversy was perpetuated.

Re: Event of the Year
 

346

Athanasius is restored as Patriarch of Alexandria.

Re: Event of the Year
 

345

Death of Bishop Nicholas of Myra, Roman priest

Re: Event of the Year
 

344

Battle of Singara: massacre of the Roman Army of Constantius II by the Persian Army of Shapur II.

Re: Event of the Year
 

343

Emperor Constans travels to Britain, possibly for a military expedition against pirates.

Re: Event of the Year
 

342

* Invasion of Goguryeo by Murong Huang of the Xianbei.
* Jin Kang Di succeeds Jin Cheng Di as emperor of China.

Re: Event of the Year
 

341

Emperor Constans bans pagan sacrifices and magic rituals under penalty of death.

Re: Event of the Year
 

340

Constantinople, capital of Emperor Constantius II becomes the largest city of the world, taking the lead from Rome, capital of Emperor Constans

Re: Event of the Year
 

339

Athanasius is deposed as Patriarch of Alexandria.

Re: Event of the Year
 

338

The Romans, allied with the Goths, arrive in the north of the empire to protect the borders.

Re: Event of the Year
 

337

September - A number of descendants of Constantius Chlorus, as well as officials of the Roman Empire, are executed. Responsibility for this purge is denied by the three Augusti.

Re: Event of the Year
 

336

The military successes of Emperor Constantine I have resulted in most of Dacia having been reconquered into the Roman Empire.

Re: Event of the Year
 

335

Emperor Constantine I begins construction of the Church of the Holy Sepulchre.

Re: Event of the Year
 

334

Reign in China of the barbarian king Che Hou. His sons try to assassinate him, but are caught and executed.

Re: Event of the Year
 

333

Hai Yang Wang succeeds Ming Di as Emperor of the Later Zhao Empire, in the Period of the Sixteen Kingdoms.

Re: Event of the Year
 

332

The Romans under Constantine I, and future Emperor Constantine II defeat the Goths in the area of the lower Danube.

Re: Event of the Year
 

331

Constantine promulgates a law against divorce and Eusebius of Caesarea writes the Onomasticon.

Re: Event of the Year
 

330

May 11 - Constantine I refounds Byzantium, renames it New Rome, and moves the capital of the Roman Empire there from Rome. It is later known as Constantinople.

Re: Event of the Year
 

329

End of the Han Zhao state.

Re: Event of the Year
 

328

Beginning of the Mayan Empire, based on the oldest known commemorative stele.

Re: Event of the Year
 

327

Christianity adopted as a state religion of Georgia.

Re: Event of the Year
 

326

# September 14 - Helena of Constantinople discovers the so-called True Cross (traditional date).
# First church built on the site of Vatican City, traditional place of Saint Peter's tomb.

Re: Event of the Year
 

325

Gladiatorial combat is outlawed in the Roman Empire.

Re: Event of the Year
 

324

St Peter's Church, Rome, founded.

Re: Event of the Year
 

323

Constantine I defeats the Sarmatians and claims the title of Sarmaticus Maximus.

Re: Event of the Year
 

322

Fiacha Sraibhtine, after having been thirty seven years as king over Ireland, was slain by the Collas, in the battle of Dubhchomar, in Crioch Rois, in Breagh.

Re: Event of the Year
 

321

Battle of Wogastisburg between the Slavs led by Samo, and the Franks led by their king, Dagobert I.

Re: Event of the Year
 

320

Under Crispus, son of Constantine I, the Franks are defeated again, assuring twenty years of peace along the Rhine border.

Re: Event of the Year
 

319

Constantine prohibits the separation of the families of slaves during a change in ownership.

Re: Event of the Year
 

318

Gregory the Illuminator appoints his son Aristax as successor in the Patriarchate of Armenia.

Re: Event of the Year
 

317

King Mirian II of Caucasian Iberia declares Christianity the official state religion.

Re: Event of the Year
 

316

* Edict of Constantine I issued in favour of slaves: he prohibits punishing them by crucifixion and facial branding.
* December - Constantine I defeats Licinius in the Battle of Mardia, and gains some of his colleague's territory

Re: Event of the Year
 

315

Constantine and Licinius battle the Sarmates, the Goths and the Carpians along the Danube. They reestablish the defence of the frontier.

Re: Event of the Year
 

314

8 October - War between Constantine I and Licinius. Licinius is defeated at the Battle of Cibalae and loses all of his territory in Europe.

Re: Event of the Year
 

313

Arius preaches of the human nature of Jesus.