21

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.

• Revolt of the Aedui under Julius Florus and Julius Sacrovir, suppressed by Gaius Silius.
• Tiberius is a 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.
• Pens and metal writing tools are made in Rome.

• Publius Sulpicius Quirinius, Roman governor of Syria
• Marcus Valerius Messalla Barbatus, Roman Consul (or 20)
• Arminius, Germanic leader who slaughtered three Roman legions at the Battle of the Teutoburg Forest.
• Empress Wang
• King Daeso of Dongbuyeo