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| 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 |
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.
Events
[change | change source]By place
[change | change source]Europe
[change | change source]- 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
[change | change source]Deaths
[change | change source]- Theophanu, empress, mother of Otto III (b. 956)
- Emperor En'yū, emperor of Japan (b. 959)