1666

1666 (MDCLXVI) was a common year starting on Friday of the Gregorian calendar and a common year starting on Monday of the Julian calendar, the 1666th year of the Common Era (CE) and Anno Domini (AD) designations, the 666th year of the 2nd millennium, the 66th year of the 17th century, and the 7th year of the 1660s decade. As of the start of 1666, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.

Millennium:	2nd millennium
Centuries:	16th century – 17th century – 18th century
Decades:	1630s  1640s  1650s  – 1660s –  1670s  1680s  1690s
Years:	1663 1664 1665 – 1666 – 1667 1668 1669

1666 in other calendars

Gregorian calendar	1666 MDCLXVI
Ab urbe condita	2419
Armenian calendar	1115 ԹՎ ՌՃԺԵ
Assyrian calendar	6416
Balinese saka calendar	1587–1588
Bengali calendar	1073
Berber calendar	2616
English Regnal year	17 Cha. 2 – 18 Cha. 2
Buddhist calendar	2210
Burmese calendar	1028
Byzantine calendar	7174–7175
Chinese calendar	乙巳年 (Wood Snake) 4362 or 4302     — to — 丙午年 (Fire Horse) 4363 or 4303
Coptic calendar	1382–1383
Discordian calendar	2832
Ethiopian calendar	1658–1659
Hebrew calendar	5426–5427
Hindu calendars
- Vikram Samvat	1722–1723
- Shaka Samvat	1587–1588
- Kali Yuga	4766–4767
Holocene calendar	11666
Igbo calendar	666–667
Iranian calendar	1044–1045
Islamic calendar	1076–1077
Japanese calendar	Kanbun 5 (寛文５年)
Javanese calendar	1588–1589
Julian calendar	Gregorian minus 10 days
Korean calendar	3999
Minguo calendar	246 before ROC 民前246年
Nanakshahi calendar	198
Thai solar calendar	2208–2209
Tibetan calendar	阴木蛇年 (female Wood-Snake) 1792 or 1411 or 639     — to — 阳火马年 (male Fire-Horse) 1793 or 1412 or 640

Events

• September – The Great Fire of London destroys most of London.