284
Centuries: 2nd century - 3rd century - 4th century
Decades: 230s 240s 250s 260s 270s - 280s - 290s 310s 320s 330s 340s
Years: 279 280 281 282 283 - 284 - 285 286 287 288 289
Events
- September 29 - Diocletian becomes Emperor of Rome
- Patriarch Rufinus I succeeds Patriarch Dometius as Patriarch of Constantinople
- Year 1 of the Coptic calendar (or 285)
Deaths
- Carinus, Roman emperor (assassinated)
- Numerian, Roman emperor
- Diophantus, Greek mathematician
