Year 331 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Potitus and Marcellus (or, less frequently, year 423 Ab urbe condita). The denomination 331 BC 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.

Millennium: 1st millennium BC
331 BC in various calendars
Gregorian calendar331 BC
Ab urbe condita423
Ancient Egypt eraXXXII dynasty, 2
- PharaohAlexander the Great, 2
Ancient Greek era112th Olympiad, year 2
Assyrian calendar4420
Balinese saka calendarN/A
Bengali calendar−923
Berber calendar620
Buddhist calendar214
Burmese calendar−968
Byzantine calendar5178–5179
Chinese calendar己丑(Earth Ox)
2366 or 2306
    — to —
庚寅年 (Metal Tiger)
2367 or 2307
Coptic calendar−614 – −613
Discordian calendar836
Ethiopian calendar−338 – −337
Hebrew calendar3430–3431
Hindu calendars
 - Vikram Samvat−274 – −273
 - Shaka SamvatN/A
 - Kali Yuga2770–2771
Holocene calendar9670
Iranian calendar952 BP – 951 BP
Islamic calendar981 BH – 980 BH
Javanese calendarN/A
Julian calendarN/A
Korean calendar2003
Minguo calendar2242 before ROC
Nanakshahi calendar−1798
Thai solar calendar212–213
Tibetan calendar阴土牛年
(female Earth-Ox)
−204 or −585 or −1357
    — to —
(male Iron-Tiger)
−203 or −584 or −1356
The Battle of Gaugamela


By placeEdit



  • While Alexander is fighting in Asia, Agis III of Sparta, profiting from the Macedonian king's absence from Greece, leads some of the Greek cities in a revolt. With Persian money and 8,000 Greek mercenaries, he holds Crete against Macedonian forces. In the Peloponnesus he routs a force under the Macedonian general Coragus and, although Athens stays neutral, he is joined by Elis, Achaea (except Pellene) and Arcadia, with the exception of Megalopolis, the staunchly anti-Spartan capital of Arcadia, which Agis III's forces besiege.
  • Alexander's regent Antipater leads the Macedonians to victory over King Agis III in the Battle of Megalopolis.


Roman RepublicEdit

  • The Gallic tribe of the Senones and the Romans conclude a peace and enter upon a period of friendly relations which lasts the rest of the century.