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991 |
| Centuries: | 9th century - 10th century - 11th century |
| Decades: | 960s 970s 980s - 990s - 1000s 1010s 1020s |
| Years: | 988 989 990 - 991 - 992 993 994 |
| 991 by topic | |
| Politics | |
| State leaders - Sovereign states | |
| Birth and death categories | |
| Births - Deaths | |
| Establishment and disestablishment categories | |
| Establishments - Disestablishments | |
| Gregorian calendar | 991 CMXCI |
| Ab urbe condita | 1744 |
| Armenian calendar | 440 ԹՎ ՆԽ |
| Bahá'í calendar | -853 – -852 |
| Berber calendar | 1941 |
| Buddhist calendar | 1535 |
| Burmese calendar | 353 |
| Byzantine calendar | 6499 – 6500 |
| Chinese calendar | 庚寅年十二月十三日 (3627/3687-12-13) — to —
辛卯年十一月廿三日(3628/3688-11-23) |
| Coptic calendar | 707 – 708 |
| Ethiopian calendar | 983 – 984 |
| Hebrew calendar | 4751 – 4752 |
| Hindu calendars | |
| - Vikram Samvat | 1046 – 1047 |
| - Shaka Samvat | 913 – 914 |
| - Kali Yuga | 4092 – 4093 |
| Holocene calendar | 10991 |
| Iranian calendar | 369 – 370 |
| Islamic calendar | 380 – 381 |
| Japanese calendar | |
| Korean calendar | 3324 |
| Thai solar calendar | 1534 |
This article documents the year AD 991.