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| Centuries: | 3rd century · 4th century · 5th century |
| Decades: | 310s 320s 330s 340s 350s 360s 370s |
| Years: | 337 338 339 340 341 342 343 |
| 340 by topic | |
| Politics | |
| State leaders - Sovereign states | |
| Birth and death categories | |
| Births - Deaths | |
| Establishment and disestablishment categories | |
| Establishments - Disestablishments | |
| Gregorian calendar | 340 CCCXL |
| Ab urbe condita | 1093 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1504 – -1503 |
| Berber calendar | 1290 |
| Buddhist calendar | 884 |
| Burmese calendar | -298 |
| Byzantine calendar | 5848 – 5849 |
| Chinese calendar | 己亥年十一月十六日 (2976/3036-11-16) — to —
庚子年十一月廿六日(2977/3037-11-26) |
| Coptic calendar | 56 – 57 |
| Ethiopian calendar | 332 – 333 |
| Hebrew calendar | 4100 – 4101 |
| Hindu calendars | |
| - Vikram Samvat | 395 – 396 |
| - Shaka Samvat | 262 – 263 |
| - Kali Yuga | 3441 – 3442 |
| Holocene calendar | 10340 |
| Iranian calendar | 282 BP – 281 BP |
| Islamic calendar | 291 BH – 290 BH |
| Japanese calendar | |
| Korean calendar | 2673 |
| Thai solar calendar | 883 |
Events
By Place
Roman Empire
- Constantinople, capital of Emperor Constantius II, becomes the largest city of the world, taking the lead from Rome, capital of Emperor Constans.[1]
- Constantine II attacks his brother Constans near Aquileia, aiming for sole control of the western half of the Empire, but is defeated.
- Constans and Constantius II split the Empire between them.
By Topic
Religion
Births
- Ambrose, church father (approximate date)
- Jerome, Bible translator (approximate date)
- Quintus Aurelius Symmachus, politician and pagan (approximate date)
Deaths
- Constantine II, joint emperor of the Roman Empire (killed in battle)
- Saint Macrina the Elder
- Yu Liang
