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.
| Millennium: | 1st millennium | 
|---|---|
| Centuries: | 1st century BC – 1st century – 2nd century | 
| Decades: | 0s BC 0s 10s – 20s – 30s 40s 50s | 
| Years: | 18 19 20 – 21 – 22 23 24 | 
| Gregorian calendar | AD 21 XXI | 
| Ab urbe condita | 774 | 
| Assyrian calendar | 4771 | 
| Balinese saka calendar | N/A | 
| Bengali calendar | −572 | 
| Berber calendar | 971 | 
| Buddhist calendar | 565 | 
| Burmese calendar | −617 | 
| Byzantine calendar | 5529–5530 | 
| Chinese calendar | 庚辰年 (Metal Dragon) 2717 or 2657 — to — 辛巳年 (Metal Snake) 2718 or 2658 | 
| Coptic calendar | −263 – −262 | 
| Discordian calendar | 1187 | 
| Ethiopian calendar | 13–14 | 
| Hebrew calendar | 3781–3782 | 
| Hindu calendars | |
| - Vikram Samvat | 77–78 | 
| - Shaka Samvat | N/A | 
| - Kali Yuga | 3121–3122 | 
| Holocene calendar | 10021 | 
| Iranian calendar | 601 BP – 600 BP | 
| Islamic calendar | 619 BH – 618 BH | 
| Javanese calendar | N/A | 
| Julian calendar | AD 21 XXI | 
| Korean calendar | 2354 | 
| Minguo calendar | 1891 before ROC 民前1891年 | 
| Nanakshahi calendar | −1447 | 
| Seleucid era | 332/333 AG | 
| Thai solar calendar | 563–564 | 
| Tibetan calendar | 阳金龙年 (male Iron-Dragon) 147 or −234 or −1006 — to — 阴金蛇年 (female Iron-Snake) 148 or −233 or −1005 | 
Events
    
- 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.
Deaths
    
- 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
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