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{{about|the year 21|other uses|21 (disambiguation)}}
{{year nav|21}}
{{Year in other calendars}}

'''21''' is a [[year]] in the [[1st century]]. It was a [[common year starting on Wednesday]] of the [[Julian calendar]]. At the time, it was known as the '''Year of the Consulship of Augustus and Caesar'''.

== Events ==
* Revolt of the [[Aedui]] under [[Julius Florus]] and [[Julius Sacrovir]], suppressed by [[Gaius Silius]].
* [[Tiberius]] is a [[List of Early Imperial Roman Consuls|Roman Consul]] for the fourth time.
* Beginning of the revolt in [[Africa]] led by [[Tacfarinas]].
* The Romans create a buffer state in the territory of the [[Quadi]] in southern [[Slovakia]].
* Construction of a barracks for the [[Praetorian Guard]] on the [[Quirinal]]. 
* [[Pen]]s and metal writing tools are made in Rome.

== Deaths ==
* Publius Sulpicius [[Quirinius]], Roman governor of [[Syria]]
* [[Marcus Valerius Messalla Barbatus]], [[List of Early Imperial Roman Consuls|Roman Consul]] (or [[20]])
* [[Arminius]], Germanic leader who slaughtered three Roman legions at the [[Battle of the Teutoburg Forest]].
* [[Empress Wang (Xin Dynasty)|Empress Wang]]
* [[Daeso|King Daeso of Dongbuyeo]]

[[Category:20s]]