320

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.

The Nydam oak boat at Gottorf Castle, Schleswig, (Germany)

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	ས་མོ་ཡོས་ལོ་ (female Earth-Hare) 446 or 65 or −707     — to — ལྕགས་ཕོ་འབྲུག་ལོ་ (male Iron-Dragon) 447 or 66 or −706

Events

By place

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.

By topic

Art

• Old St. Peter's Basilica, Rome, is started to be built (approximate date).

Culture and Religion

• 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.

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)

Deaths

• Lactantius, Christian writer (approximate date)
• Sima Bao, prince of the Jin Dynasty (b. 294)