320
Year 320 (CCCXX) was a leap year starting on Friday of the Julian calendar.
| Millennium: | 1st millennium | 
|---|---|
| Centuries: | 3rd century – 4th century – 5th century | 
| Decades: | 290s 300s 310s – 320s – 330s 340s 350s | 
| Years: | 317 318 319 – 320 – 321 322 323 | 
| Gregorian calendar | 320 CCCXX | 
| Ab urbe condita | 1073 | 
| Assyrian calendar | 5070 | 
| Balinese saka calendar | 241–242 | 
| Bengali calendar | −273 | 
| Berber calendar | 1270 | 
| Buddhist calendar | 864 | 
| Burmese calendar | −318 | 
| Byzantine calendar | 5828–5829 | 
| Chinese calendar | 己卯年 (Earth Rabbit) 3016 or 2956 — to — 庚辰年 (Metal Dragon) 3017 or 2957 | 
| Coptic calendar | 36–37 | 
| Discordian calendar | 1486 | 
| Ethiopian calendar | 312–313 | 
| Hebrew calendar | 4080–4081 | 
| Hindu calendars | |
| - Vikram Samvat | 376–377 | 
| - Shaka Samvat | 241–242 | 
| - Kali Yuga | 3420–3421 | 
| Holocene calendar | 10320 | 
| Iranian calendar | 302 BP – 301 BP | 
| Islamic calendar | 311 BH – 310 BH | 
| Javanese calendar | 201–202 | 
| Julian calendar | 320 CCCXX | 
| Korean calendar | 2653 | 
| Minguo calendar | 1592 before ROC 民前1592年 | 
| Nanakshahi calendar | −1148 | 
| Seleucid era | 631/632 AG | 
| Thai solar calendar | 862–863 | 
| Tibetan calendar | 阴土兔年 (female Earth-Rabbit) 446 or 65 or −707 — to — 阳金龙年 (male Iron-Dragon) 447 or 66 or −706 | 

Events
    
    
Roman Empire
    
- Crispus wins against the Franks.
- Licinius stopped the religious freedom promised by the Edict of Milan. He persecutes Christians in the Eastern Roman Empire.
Asia
    
- King Chandragupta I founds the Gupta dynasty in northern India.
- The Huns appear in Persia.
Art
    
- Old St. Peter's Basilica, Rome, is started to be built (approximate date).
Culture and Religion
    
Science
    
- October 18 – Pappus of Alexandria, Greek philosopher, sees an eclipse of the sun. He writes on The Great Astronomer (Almagest).
Births
    
- Aurelius Victor, historian and politician (approximate date)
- Constans I, Roman emperor (d. 350)
- Flavian I, Patriarch of Antioch (d. 404)
- Jin Jianwendi, emperor of the Jin Dynasty (d. 372)
- Oribasius, Greek physician (approximate date)
- Tuoba Shiyijian, prince of the Tuoba Dai (d. 376)
- Xie An, statesman of the Jin Dynasty (d. 385)
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