Editing 380 (section)

== Events ==

=== By place ===

==== Roman Empire ====
* [[February 27]] &ndash; [[Edict of Thessalonica]]: Theodosius I, with co-emperors [[Gratian]] and [[Valentinian II]], declare their wish that all [[Roman citizenship|Roman citizens]] convert to trinitarian [[Christianity]], in accordance with the patriarchs of [[Rome]] and [[Alexandria]], implicitly rejecting the [[Arianism]] of the patriarch of [[Constantinople]] as heretical.
* [[Battle of Thessalonica (380)|Battle of Thessalonica]]: The [[Goths]] under [[Fritigern]] defeat a Roman army in [[Macedonia (Roman province)|Macedonia]]. Theodosius I retreats to [[Thessaloniki|Thessalonica]] and leaves Gratian in control of the [[Western Roman Empire]]. 
* [[Roman Empire|Rome]]'s enemies (the [[Germanic peoples|Germans]], [[Sarmatians]] and [[Huns]]) are taken into Imperial service; as a consequence, barbarian leaders begin to play an increasingly active role in the [[Roman Empire]]. 
* [[November 24]] &ndash; Theodosius I makes his ''[[adventus (ceremony)|adventus]]'', or formal entry, into Constantinople.
* Queen [[Mawiyya|Mavia]], with her [[Saracen]] forces, defeats the [[Late Roman army|Roman army]] in southern [[Syria (region)|Syria]].
* Emperor [[Theodosius I]] is [[baptism|baptized]].<ref>{{cite book |last1=Omissi |first1=Adrastos |title=Emperors and Usurpers in the Later Roman Empire: Civil War, Panegyric, and the Construction of Legitimacy |date=2018 |publisher=Oxford University Press |isbn=978-0-19-882482-4 |page=282 |url=https://books.google.com/books?id=FP9eDwAAQBAJ&pg=PA282 |language=en}}</ref>

==== Europe ====
* The [[Visigoths|Visigothic]] chieftain [[Fritigern]] dies after ravaging the [[Balkans]]; his rival [[Athanaric]] becomes king of the entire Gothic nation.

==== India ====
* The annexation of western provinces by [[Chandragupta II]] gives him commerce with [[Europe]] and [[Egypt]].

==== Pacific ====
* [[Easter Island]], in the south Pacific Ocean, has been occupied by [[Neolithic]] seafarers under [[Hotu Matu'a]] ("supreme chief"), who about this time begin to fortify the island.

=== By topic ===
==== Arts and sciences ====
* Important works on mathematics and astronomy are written in [[Sanskrit]].

==== Religion ====

* [[Ticonius]] writes a commentary on the [[Bible]]'s [[Book of Revelation]].
* A [[cathedral]] is built in [[Augusta Treverorum]].
* The [[Council of Saragossa 380|Council of Saragossa]] is held; Spanish and [[Aquitaine|Aquitanian]] bishops condemn the teachings of [[Priscillianism]].