991

991 (CMXCI) was a common year starting on Thursday of the Julian calendar, the 991st year of the Common Era (CE) and Anno Domini (AD) designations, the 991st year of the 1st millennium, the 91st year of the 10th century, and the 2nd year of the 990s decade. As of the start of 991, the Gregorian calendar was 5 days ahead of the Julian calendar, which was the dominant calendar of the time.

Millennium:	1st millennium
Centuries:	9th century – 10th century – 11th century
Decades:	960s  970s  980s  – 990s –  1000s  1010s  1020s
Years:	988 989 990 – 991 – 992 993 994

991 in other calendars

Gregorian calendar	991 CMXCI
Ab urbe condita	1744
Armenian calendar	440 ԹՎ ՆԽ
Assyrian calendar	5741
Balinese saka calendar	912–913
Bengali calendar	398
Berber calendar	1941
Buddhist calendar	1535
Burmese calendar	353
Byzantine calendar	6499–6500
Chinese calendar	庚寅年 (Metal Tiger) 3687 or 3627     — to — 辛卯年 (Metal Rabbit) 3688 or 3628
Coptic calendar	707–708
Discordian calendar	2157
Ethiopian calendar	983–984
Hebrew calendar	4751–4752
Hindu calendars
- Vikram Samvat	1047–1048
- Shaka Samvat	912–913
- Kali Yuga	4091–4092
Holocene calendar	10991
Iranian calendar	369–370
Islamic calendar	380–381
Japanese calendar	Shōryaku 2 (正暦２年)
Javanese calendar	892–893
Julian calendar	991 CMXCI
Korean calendar	3324
Minguo calendar	921 before ROC 民前921年
Nanakshahi calendar	−477
Seleucid era	1302/1303 AG
Thai solar calendar	1533–1534
Tibetan calendar	阳金虎年 (male Iron-Tiger) 1117 or 736 or −36     — to — 阴金兔年 (female Iron-Rabbit) 1118 or 737 or −35

Events

By place

Europe

• Battle of Maldon: The Anglo-Saxons are beaten by Viking invaders led by Olaf Tryggvason, later Olaf I of Norway.
• Sweyn I of Denmark gets his throne back.

Births

• Sigurd Hlodvirsson, Earl of Orkney
• Abdullah Yousef, of Kuwait

Deaths

• Theophanu, empress, mother of Otto III (b. 956)
• Emperor En'yū, emperor of Japan (b. 959)