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| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 366 by topic |
|---|
| Leaders |
| Categories |
| Gregorian calendar | 366 CCCLXVI |
| Ab urbe condita | 1119 |
| Assyrian calendar | 5116 |
| Balinese saka calendar | 287–288 |
| Bengali calendar | −227 |
| Berber calendar | 1316 |
| Buddhist calendar | 910 |
| Burmese calendar | −272 |
| Byzantine calendar | 5874–5875 |
| Chinese calendar | 乙丑年 (Wood Ox) 3063 or 2856 — to — 丙寅年 (Fire Tiger) 3064 or 2857 |
| Coptic calendar | 82–83 |
| Discordian calendar | 1532 |
| Ethiopian calendar | 358–359 |
| Hebrew calendar | 4126–4127 |
| Hindu calendars | |
| - Vikram Samvat | 422–423 |
| - Shaka Samvat | 287–288 |
| - Kali Yuga | 3466–3467 |
| Holocene calendar | 10366 |
| Iranian calendar | 256 BP – 255 BP |
| Islamic calendar | 264 BH – 263 BH |
| Javanese calendar | 248–249 |
| Julian calendar | 366 CCCLXVI |
| Korean calendar | 2699 |
| Minguo calendar | 1546 before ROC 民前1546年 |
| Nanakshahi calendar | −1102 |
| Seleucid era | 677/678 AG |
| Thai solar calendar | 908–909 |
| Tibetan calendar | 阴木牛年 (female Wood-Ox) 492 or 111 or −661 — to — 阳火虎年 (male Fire-Tiger) 493 or 112 or −660 |
Year 366 (CCCLXVI) was a common year starting on Sunday of the Julian calendar. At the time, it was known as the Year of the Consulship of Gratianus and Dagalaifus (or, less frequently, year 1119 Ab urbe condita). The denomination 366 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.