Years: 280 281 282 283 - 284 - 285 286 287 288

Decades: 250s 260s 270s - 280s - 290s 300s 310s

Centuries: 2nd century - 3rd century - 4th century 284 (number)

Events

• November 20 - Diocletian becomes Emperor of Rome
• Patriarch Rufinus I succeeds Patriarch Dometius as Patriarch of Constantinople
• Year 1 of the Coptic calendar (or 285)
• The Bagaudae revolt against the Roman Empire in Gaul.

Births

Deaths

• November - Numerian, Roman emperor
• Diophantus, Greek mathematician (approximate date)