21

This article is about the year 21. For other uses, see 21 (disambiguation).

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

AD 21 in other calendars

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

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 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