21

This page is about the year 21. For the actual number, see twenty-one.

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

21 in other calendars

Gregorian calendar	21 XXI
Ab urbe condita	774
Armenian calendar	N/A
Assyrian calendar	4771
Bahá'í calendar	-1823–-1822
Bengali calendar	-572
Berber calendar	971
English Regnal year	N/A
Buddhist calendar	565
Burmese calendar	-617
Byzantine calendar	5529–5530
Chinese calendar	庚辰年月日 (2657/2717--Template:Chinese calendar/day/45/16) — to — 辛巳年月日 (2658/2718--Template:Chinese calendar/day/45/17)
Coptic calendar	-263–-262
Ethiopian calendar	13–14
Hebrew calendar	3781–3782
Hindu calendars
- Vikram Samvat	77–78
- Shaka Samvat	N/A
- Kali Yuga	3122–3123
Holocene calendar	10021
Iranian calendar	601 BP – 600 BP
Islamic calendar	619 BH – 618 BH
Japanese calendar
Korean calendar	2354
Minguo calendar	1891 before ROC 民前1891年
Thai solar calendar	564

21 is a year in the 1st century.

Events

By place

Roman Empire

• 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.

By topic

Arts and Sciences

• Manufacture of pens and metal writing tools 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.