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293

Tetrarchs]], Venice Tetrarchy (293)]] Year 293 (CCXCIII) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Valerius and Valerius (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.

March 1 – Emperor Diocletian and Maximian appoint Constantius Chlorus and Galerius as Caesars. This is considered the beginning of the Tetrarchy, known as the Quattuor Principes Mundi ("Four Rulers of the World").
The four Tetrarchs establish their capitals close to the Roman frontier:
- Nicomedia (northwestern Asia Minor) becomes the capital of Diocletian
- Mediolanum (Milan, near the Alps) becomes the capital of Maximian
- Augusta Treverorum (Trier, in Germany) becomes the capital of Constantius Chlorus
- Sirmium (Serbia, on the Danube border) becomes the capital of Galerius
Diocletian's Palace is built at a small bay on the Dalmatian coast, four miles from Salona, today's Split, Croatia.
Constantius Chlorus retakes some of the Gallic territories and conquers the crucial port of Bononia (modern Boulogne).
Carausius, Roman usurper, is murdered by his finance minister Allectus who proclaims himself "emperor" of Britain.
Constantius Chlorus defeats the Franks on the Rhine frontier in Batavia (Netherlands).

King Bahram II of the Persian Empire dies after a 17-year reign, his son Bahram III ascends to the throne. After four months he is murdered by viceroy Narseh with support of the nobility.
Narseh becomes king of Persia and engaded Rome in eight years of constant warfare.
Tuoba Fu succeeds his uncle Tuoba Chuo as chieftain of the Chinese Tuoba clan.