123
| Years: 119 120 121 122 - 123 - 124 125 126 127 | |
| Decades: 90s 100s 110s - 120s - 130s 140s 150s | |
| Centuries: 1st century - 2nd century - 3rd century | |
Events
- Roman Emperor Hadrian's villa at Tivoli was built.
- Chinese scientist Zhang Heng corrected the calendar to bring it into line with the seasons.
- Antinous becomes Hadrian's lover.