421

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Millennium: 1st millennium
Centuries:
Decades:
Years:
421 in various calendars
Gregorian calendar 421
CDXXI
Ab urbe condita 1174
Assyrian calendar 5171
Balinese saka calendar 342–343
Bengali calendar −172
Berber calendar 1371
Buddhist calendar 965
Burmese calendar −217
Byzantine calendar 5929–5930
Chinese calendar 庚申(Metal Monkey)
3117 or 3057
    — to —
辛酉年 (Metal Rooster)
3118 or 3058
Coptic calendar 137–138
Discordian calendar 1587
Ethiopian calendar 413–414
Hebrew calendar 4181–4182
Hindu calendars
 - Vikram Samvat 477–478
 - Shaka Samvat 342–343
 - Kali Yuga 3521–3522
Holocene calendar 10421
Iranian calendar 201 BP – 200 BP
Islamic calendar 207 BH – 206 BH
Javanese calendar 305–306
Julian calendar 421
CDXXI
Korean calendar 2754
Minguo calendar 1491 before ROC
民前1491年
Nanakshahi calendar −1047
Seleucid era 732/733 AG
Thai solar calendar 963–964
Tibetan calendar 阳金猴年
(male Iron-Monkey)
547 or 166 or −606
    — to —
阴金鸡年
(female Iron-Rooster)
548 or 167 or −605

Year 421 (CDXXI) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Agricola and Eustathius (or, less frequently, year 1174 Ab urbe condita). The denomination 421 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.

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