340s
| Millennia |
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| 1st millennium |
| Centuries |
| Decades |
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The 340s decade ran from January 1, 340, to December 31, 349.
Events
[change | change source]Significant people
[change | change source]- Constans, Roman Emperor
- Constantius II, Roman Emperor
- Flavius Philippus, praetorian prefect of the East, consul
- Hypatia of Alexandria