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.