991

991 in various 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

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

Year 991 (CMXCI) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar.

Events

Spring – Charles, duke of Lower Lorraine, is captured through the perfidy of Bishop Adalberon and is imprisoned by King Hugh I (Capet) in Orléans. Pope John XV appeals to Empress Adelaide of Italy, the grandmother and regent of the 11-year-old King Otto III to intervene. But occupied with rebellious Slavs and Bohemians, she declines.

Spring – King Æthelred II (the Unready) signs an peace treaty with Richard I (the Fearless), duke of Normandy, which is ratified in Rouen. The English coast is threatened, Viking attacks ravage Kent and Sussex.
August 11 – Battle of Maldon: The Anglo-Saxons under the Ealdorman Byrhtnoth are defeated by Norwegian Viking invaders, led by Olaf Tryggvason (later Olaf I of Norway) at Maldon (Northey Island) in Essex.[1]
Æthelred II decides to pay tribute (or Danegeld) to Olaf Tryggvason. He buys him off with a massive payment of 22,000 lbs of silver to hold off the Viking invaders and keep the peace in his realm.[2]

Spring – Fatimid troops under the defecting Hamdanid governor of Homs, Bakjur, attack Aleppo (modern Syria), but are defeated with Byzantine assistance. Bakjur is captured and executed by Emir Sa'd al-Dawla.

Summer – Council of Reims: Archbishop Arnulf (illegitimate son of the late King Lothair III) is deposed for high treason (conspiring with his uncle Charles). He is succeeded by Gerbert of Aurillac.

gollark: * accidentally

gollark: It prevents actually setting it.

gollark: Well, all are to have this.

gollark: So Rust, but with a magical theorem prover™ in it?

gollark: Or different machines, yes.

John Haywood (1995). The Historical Atlas of the Vikings: Raids on Æthelred's Kingdom, pp. 118–119. ISBN 978-0-140-51328-8.
John Haywood (1995). The historical Atlas of the Vikings: Raids on Æthelred's Kingdom, p. 118. ISBN 978-0-140-51328-8.

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

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