325 e.v.

Uriel and Dominic both declare their support of Christianity.
Litheroy becomes the archangel of Revelation.
== Asia ==
Constantine begins making Christianity the official state religion of Rome.
The Church of the Nativity is built in Bethlehem.
Wang Meng (or Jinglüe), Chinese prime minister, is born (he will die in 375 e.v.). Li Ju (or Shihui), Chinese general and warlord, dies. Tuoba Heru, Chinese prince of the Tuoba Dai, dies.
Iamblichus, Syrian philosopher and writer, dies (he was born in 245 e.v.)
=== April 1 ===
Crown Prince Cheng of Jin, age 4, succeeds his father Ming of Jin as emperor of the Eastern Jin Dynasty. During his reign, he is largely advised by regents, his uncle Yu Liang, and high-level officials.
=== May 20 ===
First Council of Nicaea: Constantine I summons an ecumenical council of bishops in Nicaea (Turkey). 
=== June 19 ===
The Nicene Creed is adopted, declaring that the members of the Trinity (the Father, the Son, and the Holy Spirit) are equal. The council decides that Easter is celebrated on the first Sunday after the first full moon after the vernal equinox. Arius is exiled to Illyria; his works are confiscated and consigned to the flames.
=== October 18 ===
Ming of Jin, Chinese emperor, dies (he was born in 299)
== Europe ==
Emperor Constantine I personally assures the security of the Danube frontier by defeating the Goths, the Vandals, and the Sarmatians.
Licinius is executed in Thessalonica, on a charge of conspiring and raising troops against Constantine I.
Gladiatorial combat is outlawed in the Roman Empire. Constantine the Great, from the Basilica of Maxentius and Constantine, Rome, is started to be made. Ammianus Marcellinus, Roman historian, is born. Procopius, Roman general and usurper, is born. Sextus Martinianus, Roman Emperor is executed
Category:Year
Category:1st millennium era vulgaris
Category:4th century era vulgaris
Category:320s era vulgaris