320

320 in other calendars
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

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

320 (CCCXX) was a leap year starting on Friday of the Julian calendar, the 320th year of the Common Era (CE) and Anno Domini (AD) designations, the 320th year of the 1st millennium, the 20th year of the 4th century, and the 1st year of the 320s decade. As of the start of 320, the Gregorian calendar was 1 day ahead of the Julian calendar, which was the dominant calendar of the time.

Events

Crispus wins against the Franks.
Licinius stopped the religious freedom promised by the Edict of Milan. He persecutes Christians in the Eastern Roman Empire.

In Nydam Mose (Denmark) the Nydam oak boat is sacrificed by the Danes. The boat is excavated in the 1830s, when a local farmer finds weapons including swords and spears.
December 25 is introduced as the birthday of Jesus.

October 18 – Pappus of Alexandria, Greek philosopher, sees an eclipse of the sun. He writes on The Great Astronomer (Almagest).