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| Centuries: | 3rd century · 4th century · 5th century |
| Decades: | 300s 310s 320s 330s 340s 350s 360s |
| Years: | 334 335 336 337 338 339 340 |
| 337 by topic | |
| Politics | |
| State leaders - Sovereign states | |
| Birth and death categories | |
| Births - Deaths | |
| Establishment and disestablishment categories | |
| Establishments - Disestablishments | |
| Gregorian calendar | 337 CCCXXXVII |
| Ab urbe condita | 1090 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1507 – -1506 |
| Berber calendar | 1287 |
| Buddhist calendar | 881 |
| Burmese calendar | -301 |
| Byzantine calendar | 5845 – 5846 |
| Chinese calendar | 丙申年十一月十三日 (2973/3033-11-13) — to —
丁酉年十一月廿三日(2974/3034-11-23) |
| Coptic calendar | 53 – 54 |
| Ethiopian calendar | 329 – 330 |
| Hebrew calendar | 4097 – 4098 |
| Hindu calendars | |
| - Vikram Samvat | 392 – 393 |
| - Shaka Samvat | 259 – 260 |
| - Kali Yuga | 3438 – 3439 |
| Holocene calendar | 10337 |
| Iranian calendar | 285 BP – 284 BP |
| Islamic calendar | 294 BH – 293 BH |
| Japanese calendar | |
| Korean calendar | 2670 |
| Thai solar calendar | 880 |
Events
By Place
Roman Empire
- September 9 — Constantine II, Constantius II, and Constans succeed their father Constantine I and rule as co-emperors of the Roman Empire. The Tetrarchy ends.
- September — A number of descendants of Constantius Chlorus, as well as officials of the Roman Empire, are executed. Responsibility for this purge is denied by the three Augusti.
- Shapur II of Persia begins a war with the Roman Empire.
By Topic
Religion
- February 6 — Pope Julius I succeeds Pope Mark as the 35th pope.
- June 17 — Constantius II announces the restoration of Athanasius as Patriarch of Alexandria.
- Paul I becomes Patriarch of Constantinople.
Births
Deaths
- May 22 — Constantine I, Roman Emperor
- September — Hannibalianus, King of the Pontus and nephew of Constantine I (executed)
- September — Dalmatius, Caesar and nephew of Constantine I (executed)
- September — Flavius Dalmatius, son of Constantius Chlorus and father of Hannibalianus and Dalmatius (executed)
- September — Julius Constantius, son of Constantius Chlorus and father of Gallus and Julian (executed)
- September — Patricius Optatus (executed)
- September — Ablavius, Prefect of the Imperial Guard (executed)
- Eustathius, Patriarch of Antioch (probable date)
- Alexander, Patriarch of Constantinople
