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| Centuries: | 3rd century · 4th century · 5th century |
| Decades: | 290s 300s 310s 320s 330s 340s 350s |
| Years: | 323 324 325 326 327 328 329 |
| 326 by topic | |
| Politics | |
| State leaders - Sovereign states | |
| Birth and death categories | |
| Births - Deaths | |
| Establishment and disestablishment categories | |
| Establishments - Disestablishments | |
| Gregorian calendar | 326 CCCXXVI |
| Ab urbe condita | 1079 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1518 – -1517 |
| Berber calendar | 1276 |
| Buddhist calendar | 870 |
| Burmese calendar | -312 |
| Chinese calendar | 2962/3022-11-11 (乙酉年十一月十一日) — to —
2963/3023-11-21(丙戌年十一月廿一日) |
| Coptic calendar | 42 – 43 |
| Ethiopian calendar | 318 – 319 |
| Hebrew calendar | 4086 – 4087 |
| Hindu calendars | |
| - Vikram Samvat | 381 – 382 |
| - Shaka Samvat | 248 – 249 |
| - Kali Yuga | 3427 – 3428 |
| Holocene calendar | 10326 |
| Iranian calendar | 296 BP – 295 BP |
| Islamic calendar | 305 BH – 304 BH |
| Japanese calendar | |
| Korean calendar | 2659 |
| Thai solar calendar | 869 |
Events
By Place
Roman Empire
- Constantine I founds Constantinople and incorporates Byzantium into the new city.
- Constantine I celebrates the twentieth anniversary of his accession to power and his triumphs over the barbarians and Licinius.
- Constantine I promulgates laws against the prostitution of maidservants, and for the humanization of prisons.
By Topic
Religion
- September 14 — Helena of Constantinople discovers the so-called True Cross (traditional date).
- The first church is built on the site of Vatican City, traditional place of Saint Peter's tomb.
- Construction begins on the churches of Golgotha.
Births
Deaths
- April 17 — Alexander, Patriarch of Alexandria
- Crispus, son of Constantine I (executed)
- Fausta, second wife of Constantine I (executed)
- Empress Liu
