90Centuries: 1st century BC - 1st century - 2nd century
- The Romans build a small "cohort-fort" in the suburbs of modern Regensburg. (approximate date)
- Pliny the Younger's appointment as urban quaestor ends.
- Domitian and Nerva are Roman Consuls.
- Cologne becomes the capital of Germania Inferior.
- Pedanius Dioscorides, Greek physician (approximate date)
- Gaius Valerius Flaccus, Roman poet (approximate date)
For the number 90, see ninety.