Editing 313 (section)

== Events ==
<onlyinclude>

=== By place ===
==== Roman Empire ====
* At the end of 312 or in early 313, the retired Emperor [[Diocletian]] dies in his palace in [[Split, Croatia|Split]], most likely from natural causes.
* [[February]]: Emperors [[Constantine I]] and [[Licinius]] convene in [[Mediolanum]] (modern [[Milan]]). Licinius marries Constantine's half-sister [[Flavia Julia Constantia|Constantia]], and they issue the [[Edict of Milan]]. This edict ends the [[Great Persecution]] against the [[Christians]] and is the first piece of legislation in western history to decree [[freedom of religion]]. It also returns property confiscated from Christians.<ref name="Frend">{{cite book|last=Frend|first=W. H. C.|title=The Early Church|publisher=SPCK|year=1965|page=137}}</ref> The edict is posted in [[Nicomedia]] on June 13.
* Emperor [[Maximinus Daza]] crosses the [[Bosphorus]] with an army of 70,000 men and lays siege to [[Marmara Ereğlisi|Heraclea]] in [[Thrace]]. He captures the city after eight days.
* [[Battle of Tzirallum]]: Licinius defeats his rival Maximinus in Thrace, who then flees to [[Cilicia]]. After losing the [[Cilician Gates]] to Licinius' forces, Maximinus commits suicide.
* Licinius conducts a purge of the wider Tetrarchic dynasty. He executes [[Galerius]]' son [[Candidianus (son of Galerius)|Candidianus]], [[Valerius Severus]]' son [[Flavius Severianus|Severianus]] (whom he accuses of conspiracy), and Maximinus' wife, son and daughter. Diocletian's wife [[Prisca (empress)|Prisca]] and daughter [[Galeria Valeria]] go into hiding.

==== Asia ====
* [[March 14]] &ndash; [[Emperor Huai of Jin]] is executed by [[Liu Cong (Han Zhao)|Liu Cong]], ruler of the [[Xiongnu]] state ([[Han Zhao|Han-Zhao]]). At the imperial [[Chinese New Year|new year]] he and a number of former [[Jin dynasty (266–420)|Jin]] officials are poisoned. Crown prince [[Emperor Min of Jin|Min of Jin]], age 13, succeeds, in [[Chang'an]], his uncle Huai of Jin and becomes the new emperor of the [[Jin dynasty (265–420)|Jin Dynasty]].
* [[Emperor Nintoku|Nintoku]], the fourth son of [[Emperor Ōjin|Ōjin]], becomes the [[List of Emperors of Japan|16th emperor]] of [[Japan]]. The historical profile of Nintoku is generally accepted as fact without attributing all of the things he allegedly accomplished.<ref name=":0">{{Cite book|last=Wetzler|first=Peter|url=https://books.google.com/books?id=g58BEAAAQBAJ&dq=historicity+of+Emperor+Jimmu&pg=PA101|title=Hirohito and War: Imperial Tradition and Military Decision Making in Prewar Japan|date=1998-02-01|publisher=University of Hawaii Press|isbn=978-0-8248-6285-5|pages=101|language=en}}</ref>

=== By topic ===
==== Art and Science ====
* [[Basilica of Maxentius and Constantine]] (or '''Basilica Nova'''), in [[Ancient Rome|Rome]], is finished.

==== Religion ====
* [[February 3]] &ndash; [[Edict of Milan]]: [[Constantine the Great]] and co-emperor [[Licinius]] meet at a conference in [[Mediolanum]] (modern [[Milan]]). They proclaim a policy of religious freedom for all, ending the persecution of Christians in the [[Roman Empire]] and returning property confiscated from Christians. The edict is posted in [[Nicomedia]] on June 13.
* [[October 2]] &ndash; [[Lateran council|Lateran Synod]]: [[Donatism]] is declared a [[Heresy in Christianity|heresy]].
* [[Arius]] preaches of the human nature of [[Jesus]]. </onlyinclude>