AD 91
| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| Gregorian calendar | AD 91 XCI |
| Ab urbe condita | 844 |
| Assyrian calendar | 4841 |
| Bengali calendar | −502 |
| Berber calendar | 1041 |
| Buddhist calendar | 635 |
| Burmese calendar | −547 |
| Byzantine calendar | 5599–5600 |
| Chinese calendar |
庚寅年 (Metal Tiger) 2787 or 2727 — to — 辛卯年 (Metal Rabbit) 2788 or 2728 |
| Coptic calendar | −193 – −192 |
| Discordian calendar | 1257 |
| Ethiopian calendar | 83–84 |
| Hebrew calendar | 3851–3852 |
| Hindu calendars | |
| - Vikram Samvat | 147–148 |
| - Shaka Samvat | 12–13 |
| - Kali Yuga | 3191–3192 |
| Holocene calendar | 10091 |
| Iranian calendar | 531 BP – 530 BP |
| Islamic calendar | 547 BH – 546 BH |
| Javanese calendar | N/A |
| Julian calendar | AD 91 XCI |
| Korean calendar | 2424 |
| Minguo calendar | 1821 before ROC 民前1821年 |
| Nanakshahi calendar | −1377 |
| Seleucid era | 402/403 AG |
| Thai solar calendar | 633–634 |
AD 91 (XCI) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Glabrio and Traianus (or, less frequently, year 844 Ab urbe condita). The denomination AD 91 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
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