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266 BC in various calendars
Gregorian calendar	266 BC; CCLXVI BC
Ab urbe condita	488
Ancient Egypt era	XXXIII dynasty, 58
- Pharaoh	Ptolemy II Philadelphus, 18
Ancient Greek Olympiad (summer)	128th Olympiad, year 3
Assyrian calendar	4485
Balinese saka calendar	N/A
Bengali calendar	−859 – −858
Berber calendar	685
Buddhist calendar	279
Burmese calendar	−903
Byzantine calendar	5243–5244
Chinese calendar	甲午年 (Wood Horse); 2432 or 2225; — to —; 乙未年 (Wood Goat); 2433 or 2226
Coptic calendar	−549 – −548
Discordian calendar	901
Ethiopian calendar	−273 – −272
Hebrew calendar	3495–3496
Hindu calendars
- Vikram Samvat	−209 – −208
- Shaka Samvat	N/A
- Kali Yuga	2835–2836
Holocene calendar	9735
Iranian calendar	887 BP – 886 BP
Islamic calendar	914 BH – 913 BH
Javanese calendar	N/A
Julian calendar	N/A
Korean calendar	2068
Minguo calendar	2177 before ROC; 民前2177年
Nanakshahi calendar	−1733
Seleucid era	46/47 AG
Thai solar calendar	277–278
Tibetan calendar	ཤིང་ཕོ་རྟ་ལོ་; (male Wood-Horse); −139 or −520 or −1292; — to —; ཤིང་མོ་ལུག་ལོ་; (female Wood-Sheep); −138 or −519 or −1291

Year 266 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Pera and Pictor^[1] (or, less frequently, year 488 Ab urbe condita). The denomination 266 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

Roman Republic

January 23 – Marcus Atilius Regulus and Lucius Julius Libo celebrate triumphs over the Salentini.
Calabria and Messapia are annexed by the Roman Republic.

Asia Minor

Ariobarzanes becomes the second king of Pontus, succeeding his father Mithridates I Ctistes.

India

The Mauryan emperor Ashoka converts to Buddhism.

Births

Berenice II, queen and co-regent of Egypt (or 267 BC)

Deaths

Huiwen of Zhao, Chinese king of Zhao (b. 310 BC)
Mithridates I Ctistes, founder of the kingdom of Pontus

References

^ Mackay, Christopher S. "Consuls of the Roman Republic". University of Alberta. Retrieved August 21, 2026.

[1] Mackay, Christopher S. "Consuls of the Roman Republic". University of Alberta. Retrieved August 21, 2026.

[1]

Gregorian calendar	266 BC CCLXVI BC
Ab urbe condita	488
Ancient Egypt era	XXXIII dynasty, 58
- Pharaoh	Ptolemy II Philadelphus, 18
Ancient Greek Olympiad (summer)	128th Olympiad, year 3
Assyrian calendar	4485
Balinese saka calendar	N/A
Bengali calendar	−859 – −858
Berber calendar	685
Buddhist calendar	279
Burmese calendar	−903
Byzantine calendar	5243–5244
Chinese calendar	甲午年 (Wood Horse) 2432 or 2225 — to — 乙未年 (Wood Goat) 2433 or 2226
Coptic calendar	−549 – −548
Discordian calendar	901
Ethiopian calendar	−273 – −272
Hebrew calendar	3495–3496
Hindu calendars
- Vikram Samvat	−209 – −208
- Shaka Samvat	N/A
- Kali Yuga	2835–2836
Holocene calendar	9735
Iranian calendar	887 BP – 886 BP
Islamic calendar	914 BH – 913 BH
Javanese calendar	N/A
Julian calendar	N/A
Korean calendar	2068
Minguo calendar	2177 before ROC 民前2177年
Nanakshahi calendar	−1733
Seleucid era	46/47 AG
Thai solar calendar	277–278
Tibetan calendar	ཤིང་ཕོ་རྟ་ལོ་ (male Wood-Horse) −139 or −520 or −1292 — to — ཤིང་མོ་ལུག་ལོ་ (female Wood-Sheep) −138 or −519 or −1291

266 BC