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| Centuries: | 3rd century · 4th century · 5th century |
| Decades: | 270s 280s 290s 300s 310s 320s 330s |
| Years: | 306 307 308 309 310 310 311 |
| 309 by topic | |
| Politics | |
| State leaders - Sovereign states | |
| Birth and death categories | |
| Births - Deaths | |
| Establishment and disestablishment categories | |
| Establishments - Disestablishments | |
| Gregorian calendar | 309 CCCIX |
| Ab urbe condita | 1062 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1535 – -1534 |
| Berber calendar | 1259 |
| Buddhist calendar | 853 |
| Burmese calendar | -329 |
| Byzantine calendar | 5817 – 5818 |
| Chinese calendar | 戊辰年十二月初四日 (2945/3005-12-4) — to —
己巳年十一月十四日(2946/3006-11-14) |
| Coptic calendar | 25 – 26 |
| Ethiopian calendar | 301 – 302 |
| Hebrew calendar | 4069 – 4070 |
| Hindu calendars | |
| - Vikram Samvat | 364 – 365 |
| - Shaka Samvat | 231 – 232 |
| - Kali Yuga | 3410 – 3411 |
| Holocene calendar | 10309 |
| Iranian calendar | 313 BP – 312 BP |
| Islamic calendar | 323 BH – 322 BH |
| Japanese calendar | |
| Korean calendar | 2642 |
| Thai solar calendar | 852 |
Events
By Place
Roman Empire
- The Spanish provinces revolt from the control of Maxentius, acknowledging Constantine as their Emperor.
- The construction of a stone bridge across the Rhine near Cologne is completed.
Asia
By Topic
Religion
- Pope Marcellus I is banished from Rome, as is his successor Eusebius later that year.
- April 18 — Pope Eusebius succeeds Pope Marcellus I as the 31st pope.
Births
- Didymus the Blind, an ecclesiastical writer of Alexandria (approximate)
Deaths
- Pope Marcellus I
- Alban (possible date — also 304)
- Hormizd II of Persia
- Saint Elias and companions
