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|Centuries:||1st century – 2nd century – 3rd century|
|Decades:||90s 100s 110s – 120s – 130s 140s 150s|
|Years:||120 121 122 – 123 – 124 125 126|
|123 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||876|
|Chinese calendar||壬戌年 (Water Dog)
2819 or 2759
— to —
癸亥年 (Water Pig)
2820 or 2760
|Coptic calendar||−161 – −160|
|- Vikram Samvat||179–180|
|- Shaka Samvat||44–45|
|- Kali Yuga||3223–3224|
|Iranian calendar||499 BP – 498 BP|
|Islamic calendar||514 BH – 513 BH|
|Minguo calendar||1789 before ROC
|Seleucid era||434/435 AG|
|Thai solar calendar||665–666|
Year 123 (CXXIII) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Paetinus and Apronius (or, less frequently, year 876 Ab urbe condita). The denomination 123 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.
- Emperor Hadrian averts a war with Parthia by a personal meeting with Osroes I.
- Housesteads Fort is constructed on Hadrian's Wall north of Bardon Mill.
- Hadrian's Villa at Tivoli is built.
- In China, Ban Yong, son of Ban Chao, reestablishes the Chinese control over the Tarim Basin.
- The Chinese government establishes Aide of the Western Regions over the Tarim Basin.
Arts and sciences
- Kanishka I (later according to other sources)