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231 BC in various calendars
Gregorian calendar	231 BC; CCXXXI BC
Ab urbe condita	523
Ancient Egypt era	XXXIII dynasty, 93
- Pharaoh	Ptolemy III Euergetes, 16
Ancient Greek era	137th Olympiad, year 2
Assyrian calendar	4520
Balinese saka calendar	N/A
Bengali calendar	−823
Berber calendar	720
Buddhist calendar	314
Burmese calendar	−868
Byzantine calendar	5278–5279
Chinese calendar	己巳年 (Earth Snake); 2467 or 2260; — to —; 庚午年 (Metal Horse); 2468 or 2261
Coptic calendar	−514 – −513
Discordian calendar	936
Ethiopian calendar	−238 – −237
Hebrew calendar	3530–3531
Hindu calendars
- Vikram Samvat	−174 – −173
- Shaka Samvat	N/A
- Kali Yuga	2870–2871
Holocene calendar	9770
Iranian calendar	852 BP – 851 BP
Islamic calendar	878 BH – 877 BH
Javanese calendar	N/A
Julian calendar	N/A
Korean calendar	2103
Minguo calendar	2142 before ROC; 民前2142年
Nanakshahi calendar	−1698
Seleucid era	81/82 AG
Thai solar calendar	312–313
Tibetan calendar	阴土蛇年; (female Earth-Snake); −104 or −485 or −1257; — to —; 阳金马年; (male Iron-Horse); −103 or −484 or −1256

Millennium:	1st millennium BC
Centuries:	4th century BC; 3rd century BC ; 2nd century BC;
Decades:	250s BC; 240s BC; 230s BC ; 220s BC; 210s BC;
Years:	234 BC; 233 BC; 232 BC; 231 BC ; 230 BC; 229 BC; 228 BC;

Year 231 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Matho and Maso (or, less frequently, year 523 Ab urbe condita). The denomination 231 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.

Events

By place

Greece

Demetrius II, king of Macedonia, seeks military help from Agron, king of Illyria, a loosely organized state on the Adriatic coast north of Epirus, against the advancing Aetolians. The Illyrian army routs the Aetolians and returns home as the victor.