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Year 293 (CCXCIII) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar. In the Roman Empire, it was known as the Year of the Consulship of Diocletian and Maximian (or, less frequently, year 1046 Ab urbe condita). The denomination 293 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
|Ab urbe condita||1046|
|Balinese saka calendar||214–215|
|Chinese calendar||壬子年 (Water Rat)|
2989 or 2929
— to —
癸丑年 (Water Ox)
2990 or 2930
|- Vikram Samvat||349–350|
|- Shaka Samvat||214–215|
|- Kali Yuga||3393–3394|
|Iranian calendar||329 BP – 328 BP|
|Islamic calendar||339 BH – 338 BH|
|Minguo calendar||1619 before ROC|
|Seleucid era||604/605 AG|
|Thai solar calendar||835–836|
419 or 38 or −734
— to —
420 or 39 or −733
- March 1 – Emperors Diocletian and Maximian appoint Constantius I and Galerius as 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 Gallic territories from the usurper Carausius. He conquers the crucial port of Bononia (modern Boulogne).
- Towards the end of the year, Carausius is murdered by his finance minister Allectus, who proclaims himself the new emperor of Britain.
- In this or the following year, Constantius defeats the Franks in 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 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 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.
- King Bahram II of the 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.
- Probus succeeds Rufinus, as Patriarch of Constantinople.
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