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|331 by topic|
|Ab urbe condita||1084|
|Balinese saka calendar||252–253|
|Chinese calendar||庚寅年 (Metal Tiger)|
3027 or 2967
— to —
辛卯年 (Metal Rabbit)
3028 or 2968
|- Vikram Samvat||387–388|
|- Shaka Samvat||252–253|
|- Kali Yuga||3431–3432|
|Iranian calendar||291 BP – 290 BP|
|Islamic calendar||300 BH – 299 BH|
|Minguo calendar||1581 before ROC|
|Seleucid era||642/643 AG|
|Thai solar calendar||873–874|
457 or 76 or −696
— to —
458 or 77 or −695
Year 331 (CCCXXXI) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Bassus and Ablabius (or, less frequently, year 1084 Ab urbe condita). The denomination 331 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.
- Emperor Constantine the Great vigorously promotes Christianity, confiscating the property and valuables of a number of pagan temples throughout the Roman Empire.
- Constantine I dedicates the Church of the Holy Apostles in Constantinople.
- Constantine I promulgates a law against divorce.
Arts and sciences
- Eusebius of Caesarea writes the Onomasticon.
- Jovian, Roman Emperor (d. 364)
- Julian the Apostate, Roman Emperor (d. 363)
- Yao Chang, emperor of the Qiang state Later Qin (d. 394)
- Gregory the Illuminator, patron saint and first official head of the Armenian Apostolic Church
- Micheon of Goguryeo, 15th ruler of Goguryeo
- "List of Rulers of Korea". metmuseum.org. Retrieved April 19, 2019.