660
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| Millennium |
| 1st millennium |
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| 660 by topic |
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| Arts, history, and science |
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| Lists of leaders |
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| Gregorian calendar | 660 DCLX |
| Ab urbe condita | 1413 |
| Armenian calendar | 109 ԹՎ ՃԹ |
| Assyrian calendar | 5410 |
| Balinese saka calendar | 581–582 |
| Bengali calendar | 67 |
| Berber calendar | 1610 |
| Buddhist calendar | 1204 |
| Burmese calendar | 22 |
| Byzantine calendar | 6168–6169 |
| Chinese calendar | 己未年 (Earth Goat) 3356 or 3296 — to — 庚申年 (Metal Monkey) 3357 or 3297 |
| Coptic calendar | 376–377 |
| Discordian calendar | 1826 |
| Ethiopian calendar | 652–653 |
| Hebrew calendar | 4420–4421 |
| Hindu calendars | |
| - Vikram Samvat | 716–717 |
| - Shaka Samvat | 581–582 |
| - Kali Yuga | 3760–3761 |
| Holocene calendar | 10660 |
| Iranian calendar | 38–39 |
| Islamic calendar | 39–40 |
| Japanese calendar | N/A |
| Javanese calendar | 551–552 |
| Julian calendar | 660 DCLX |
| Korean calendar | 2993 |
| Minguo calendar | 1252 before ROC 民前1252年 |
| Nanakshahi calendar | −808 |
| Seleucid era | 971/972 AG |
| Thai solar calendar | 1202–1203 |
| Tibetan calendar | ས་མོ་ལུག་ལོ་ (female Earth-Sheep) 786 or 405 or −367 — to — ལྕགས་ཕོ་སྤྲེ་ལོ་ (male Iron-Monkey) 787 or 406 or −366 |
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660 (DCLX) was a leap year starting on Wednesday of the Julian calendar, the 660th year of the Common Era (CE) and Anno Domini (AD) designations, the 660th year of the 1st millennium, the 60th year of the 7th century, and the 1st year of the 660s decade. As of the start of 660, the Gregorian calendar was 3 days ahead of the Julian calendar, which was the dominant calendar of the time.
Events
- The Umayyad Empire was established.
- In the year 660 the kingdom of Silla invaded the kingdom of Baekje. (see Korea)
- Empress Saimei of Japan makes an order to dispatch a force to the Korean Peninsula to save Baekje.