1123
| Years |
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| Millennium |
| 2nd millennium |
| Centuries |
| Decades |
| Years |
| 1123 by topic |
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| Arts, history, and science |
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| Countries |
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| Lists of leaders |
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| Birth and death categories |
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| Establishments and disestablishments categories |
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| Works category |
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| Gregorian calendar | 1123 MCXXIII |
| Ab urbe condita | 1876 |
| Armenian calendar | 572 ԹՎ ՇՀԲ |
| Assyrian calendar | 5873 |
| Balinese saka calendar | 1044–1045 |
| Bengali calendar | 530 |
| Berber calendar | 2073 |
| English Regnal year | 23 Hen. 1 – 24 Hen. 1 |
| Buddhist calendar | 1667 |
| Burmese calendar | 485 |
| Byzantine calendar | 6631–6632 |
| Chinese calendar | 壬寅年 (Water Tiger) 3819 or 3759 — to — 癸卯年 (Water Rabbit) 3820 or 3760 |
| Coptic calendar | 839–840 |
| Discordian calendar | 2289 |
| Ethiopian calendar | 1115–1116 |
| Hebrew calendar | 4883–4884 |
| Hindu calendars | |
| - Vikram Samvat | 1179–1180 |
| - Shaka Samvat | 1044–1045 |
| - Kali Yuga | 4223–4224 |
| Holocene calendar | 11123 |
| Igbo calendar | 123–124 |
| Iranian calendar | 501–502 |
| Islamic calendar | 516–517 |
| Japanese calendar | Hōan 4 (保安４年) |
| Javanese calendar | 1028–1029 |
| Julian calendar | 1123 MCXXIII |
| Korean calendar | 3456 |
| Minguo calendar | 789 before ROC 民前789年 |
| Nanakshahi calendar | −345 |
| Seleucid era | 1434/1435 AG |
| Thai solar calendar | 1665–1666 |
| Tibetan calendar | ཆུ་ཕོ་སྟག་ལོ་ (male Water-Tiger) 1249 or 868 or 96 — to — ཆུ་མོ་ཡོས་ལོ་ (female Water-Hare) 1250 or 869 or 97 |
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1123 (MCXXIII) was a common year starting on Monday of the Julian calendar, the 1123rd year of the Common Era (CE) and Anno Domini (AD) designations, the 123rd year of the 2nd millennium, the 23rd year of the 12th century, and the 4th year of the 1120s decade. As of the start of 1123, the Gregorian calendar was 7 days ahead of the Julian calendar, which was the dominant calendar of the time.
Events
- First Council of the Lateran confirms Concordat of Worms and demands that priests remain celibate.
- End of the reign of Emperor Toba, emperor of Japan.
- Emperor Sutoku ascends to the throne of Japan.
- St Bartholomew's Hospital (Barts) founded in London, England.
- The Pactum Warmundi is established between the Republic of Venice and the Kingdom of Jerusalem.
Births
- Minamoto no Yoshitomo, Japanese general (d. 1160)
- Leonardo Fibonacci, Mathematician born (d. 1209)