Editing 293 (section)

== Events ==
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=== By place ===
==== Roman Empire ====
* [[March 1]] – Emperors [[Diocletian]] and [[Maximian]] appoint [[Constantius I]] and [[Galerius]] as [[Caesar (title)|Caesars]]. This is considered the beginning of the [[Tetrarchy]], known as the ''Quattuor Principes Mundi'' ("Four Rulers of the World"). (Some sources and scholars date Galerius' elevation to [[May 21]].)
* Constantius retakes some of the [[Gaul|Gallic]] territories from the usurper [[Carausius]]. He conquers the crucial port of [[Boulogne-sur-Mer#History|Bononia]] (modern [[Boulogne-sur-Mer|Boulogne]]).
* Towards the end of the year, Carausius is murdered by his finance minister [[Allectus]], who proclaims himself the new emperor of [[Roman Britain|Britain]].
* In this or the following year, Constantius defeats the [[Franks]] in [[Batavi (Germanic tribe)|Batavia]] ([[Netherlands]]).
* Galerius begins a series of two campaigns in Upper Egypt against the rebel cities of [[Coptos]] and Boresis as well as the [[Blemmyes]] and [[Kingdom of Kush|Meroitic Nubians]].
* Over the course of his reign, but especially from the time of the Tetrarchy's creation, Diocletian divides the large provinces of the early empire into smaller administrative units, and he groups these new smaller provinces into [[Roman Diocese|dioceses]]. He also accelerates the third-century trend whereby the administration and military of the provinces are increasingly divided between governors and generals (''duces'') respectively, whereas formerly governors had also been in charge of the legions. This expansion of imperial personnel increases Diocletian's control over the empire and weakens the power of individual officials and officers. Moreover, Diocletian expands the retinues of the individual emperors to have more ministers and secretaries, thus establishing what will become known as the late Roman [[Consistorium]].

==== Persia ====
* King [[Bahram II]] of the [[Sassanid Empire|Persian Empire]] dies after a 17-year reign; his son [[Bahram III]] ascends to the throne. After four months, Bahram III's great-uncle [[Narseh]], the king of [[Persarmenia]], marches on the Persian capital [[Ctesiphon]] with the support of a faction of the nobility and the eastern Satraps. Bahram is overthrown and Narseh is declared the new King of Kings.

==== China ====
* [[Tuoba Fu]] succeeds his uncle [[Tuoba Chuo]], as chieftain of the Chinese [[Tuoba]] Clan.

=== By topic ===
==== Religion ====
* Probus succeeds Rufinus, as [[Ecumenical Patriarch of Constantinople|Bishop of Byzantium]].
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