| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
|
| Gregorian calendar | 309 CCCIX |
| Ab urbe condita | 1062 |
| Assyrian calendar | 5059 |
| Balinese saka calendar | 230–231 |
| Bengali calendar | −284 |
| Berber calendar | 1259 |
| Buddhist calendar | 853 |
| Burmese calendar | −329 |
| Byzantine calendar | 5817–5818 |
| Chinese calendar | 戊辰年 (Earth Dragon) 3005 or 2945 — to — 己巳年 (Earth Snake) 3006 or 2946 |
| Coptic calendar | 25–26 |
| Discordian calendar | 1475 |
| Ethiopian calendar | 301–302 |
| Hebrew calendar | 4069–4070 |
| Hindu calendars | |
| - Vikram Samvat | 365–366 |
| - Shaka Samvat | 230–231 |
| - Kali Yuga | 3409–3410 |
| Holocene calendar | 10309 |
| Iranian calendar | 313 BP – 312 BP |
| Islamic calendar | 323 BH – 322 BH |
| Javanese calendar | 189–190 |
| Julian calendar | 309 CCCIX |
| Korean calendar | 2642 |
| Minguo calendar | 1603 before ROC 民前1603年 |
| Nanakshahi calendar | −1159 |
| Seleucid era | 620/621 AG |
| Thai solar calendar | 851–852 |
| Tibetan calendar | 阳土龙年 (male Earth-Dragon) 435 or 54 or −718 — to — 阴土蛇年 (female Earth-Snake) 436 or 55 or −717 |
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Diocesis of Hispania
Year 309 (CCCIX) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Licinianus and Constantius (or, less frequently, year 1062 Ab urbe condita). The denomination 309 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
Events
By place
Roman Empire
- The Spanish provinces revolt from the control of Maxentius, acknowledging Constantine the Great as their Emperor.
- A plague that may be related to anthrax spreads across the Roman Empire, causing a drastic decline in the population.
Persia
- King Hormizd II, Shah of the Persian Empire, dies after a 7-year reign and a power struggle for the succession ensues. He is succeeded by his son Shapur II.
North America
- The limber pine called Twister begins growing.
By topic
Religion
- Pope Marcellus I is banished from Rome by the Emperor Maxentius.
- April 18 – Pope Eusebius succeeds Marcellus as the 31st pope, but is himself banished on August 17 to Sicily (These events may have taken place in 310).
Deaths
- Saint Alban (possible date—also 304)
- Saint Elias and companions
- Hormizd II, king of the Persian Empire
- Pope Marcellus I