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This article is about the year 21. For the number, see 21 (number). For other uses, see 21 (disambiguation).
Millennium: 1st millennium
Centuries: 1st century BC1st century2nd century
Decades: 0s BC  0s  10s  – 20s –  30s  40s  50s
Years: 18 19 202122 23 24
21 by topic
State leadersSovereign states
Birth and death categories
Establishment and disestablishment categories
21 in other calendars
Gregorian calendar 21
Ab urbe condita 774
Assyrian calendar 4771
Bengali calendar −572
Berber calendar 971
Buddhist calendar 565
Burmese calendar −617
Byzantine calendar 5529–5530
Chinese calendar 庚辰(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 3122–3123
Holocene calendar 10021
Iranian calendar 601 BP – 600 BP
Islamic calendar 619 BH – 618 BH
Julian calendar 21
Korean calendar 2354
Minguo calendar 1891 before ROC
Seleucid era 332/333 AG
Thai solar calendar 563–564

Year 21 (XXI) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Augustus and Caesar (or, less frequently, year 774 Ab urbe condita). The denomination 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.


By place[edit]

Roman Empire[edit]


By topic[edit]

Arts and sciences[edit]

  • The manufacture of pens and metal writing tools begins in Rome.



Discovery of Ameus and Romulus