138
| Years: 134 135 136 137 - 138 - 139 140 141 142 | |
| Decades: 100s 110s 120s - 130s - 140s 150s 160s | |
| Centuries: 1st century - 2nd century - 3rd century | |
Events
- February 25 - Roman emperor Hadrian adopted Antoninus Pius on condition that Antonius would adopt Marcus Annius Aurelius Verus.
- July 10 - Antoninus Pius succeeds Hadrian as Roman emperor
- Zhi becomes emperor of the Han Dynasty in China.
Births
Deaths
- July 10 - Hadrian, Roman emperor, died at Baiae
- Zenobius - Greek sophist who taught rhetoric at Rome