Year 266 (CCLXVI) was a common year starting on Monday of the Julian calendar.
| Gregorian calendar | 266 CCLXVI |
| Ab urbe condita | 1019 |
| Assyrian calendar | 5016 |
| Balinese saka calendar | 187–188 |
| Bengali calendar | −327 |
| Berber calendar | 1216 |
| Buddhist calendar | 810 |
| Burmese calendar | −372 |
| Byzantine calendar | 5774–5775 |
| Chinese calendar | 乙酉年 (Wood Rooster) 2962 or 2902 — to — 丙戌年 (Fire Dog) 2963 or 2903 |
| Coptic calendar | −18 – −17 |
| Discordian calendar | 1432 |
| Ethiopian calendar | 258–259 |
| Hebrew calendar | 4026–4027 |
| Hindu calendars | |
| - Vikram Samvat | 322–323 |
| - Shaka Samvat | 187–188 |
| - Kali Yuga | 3366–3367 |
| Holocene calendar | 10266 |
| Iranian calendar | 356 BP – 355 BP |
| Islamic calendar | 367 BH – 366 BH |
| Javanese calendar | 145–146 |
| Julian calendar | 266 CCLXVI |
| Korean calendar | 2599 |
| Minguo calendar | 1646 before ROC 民前1646年 |
| Nanakshahi calendar | −1202 |
| Seleucid era | 577/578 AG |
| Thai solar calendar | 808–809 |
| Tibetan calendar | ཤིང་མོ་བྱ་ལོ་ (female Wood-Bird) 392 or 11 or −761 — to — མེ་ཕོ་ཁྱི་ལོ་ (male Fire-Dog) 393 or 12 or −760 |
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Events
changeBy place
changeRoman Empire
change- King Odaenathus of Palmyra invades Persia. He takes the capital Ctesiphon. He gives himself with the title "king of kings".
Ireland
change- The rule of High King Cormac mac Airt ends (approximate date).
Births
change- Wang Dun, general of the Jin Dynasty (d. 324)