AD 21 (XXI) was known as the Year of the Consulship of Tiberius and Drusus (or, less frequently, year 774 Ab urbe condita). The denomination AD 21 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
|Gregorian calendar||AD 21|
|Ab urbe condita||774|
|Balinese saka calendar||N/A|
|Chinese calendar||庚辰年 (Metal Dragon)|
2717 or 2657
— to —
辛巳年 (Metal Snake)
2718 or 2658
|Coptic calendar||−263 – −262|
|- Vikram Samvat||77–78|
|- Shaka Samvat||N/A|
|- Kali Yuga||3121–3122|
|Iranian calendar||601 BP – 600 BP|
|Islamic calendar||619 BH – 618 BH|
|Julian calendar||AD 21|
|Minguo calendar||1891 before ROC|
|Seleucid era||332/333 AG|
|Thai solar calendar||563–564|
147 or −234 or −1006
— to —
148 or −233 or −1005
- The Aedui revolt under Julius Florus and Julius Sacrovir; the revolt is suppressed by Gaius Silius.
- Emperor Tiberius is a Roman Consul for the fourth time.
- The Romans create a buffer state in the territory of the Quadi, in southern Slovakia.
- Barracks are constructed for the Praetorian Guard, on the Quirinal (located on the Seven Hills of Rome).
- King Daeso of Dongbuyeo is killed in battle against the armies of Goguryeo, led by its third ruler, King Daemusin.
Art and ScienceEdit
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- Arminius, Germanic military leader (b. 18/17 BC)
- Clutorius Priscus, Roman poet (b. c. 20 BC)
- Daeso of Dongbuyeo, Korean king (b. 60 BC)
- Marcus Valerius Messalla Barbatus, Roman consul (b. 11 BC)
- Publius Sulpicius Quirinius, Roman governor (b. c. 51 BC)
- Wang (or Xiaomu), Chinese empress of the Xin Dynasty