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| Millennium: | 1st millennium |
| Centuries: | 3rd century - 4th century - 5th century |
| Decades: | 310s 320s 330s - 340s - 350s 360s 370s |
| Years: | 340 341 342 343 344 345 346 347 348 349 |
| Categories: | Births - Deaths - Architecture Establishments - Disestablishments |
Events and Trends
Significant people
- Constans, Roman Emperor
- Constantius II, Roman Emperor
- Flavius Philippus, praetorian prefect of the East, consul
- Hypatia of Alexandria