| Millennium: | 1st millennium |
|---|---|
| Centuries: | 4th century – 5th century – 6th century |
| Decades: | 390s 400s 410s – 420s – 430s 440s 450s |
| Years: | 418 419 420 – 421 – 422 423 424 |
| 421 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 421 CDXXI |
| Ab urbe condita | 1174 |
| Armenian calendar | N/A |
| Assyrian calendar | 5171 |
| Bahá'í calendar | -1423–-1422 |
| Bengali calendar | -172 |
| Berber calendar | 1371 |
| English Regnal year | N/A |
| Buddhist calendar | 965 |
| Burmese calendar | -217 |
| Byzantine calendar | 5929–5930 |
| Chinese calendar | 庚申年十一月十二日 (3057/3117-11-12) — to —
辛酉年十一月廿二日(3058/3118-11-22) |
| Coptic calendar | 137–138 |
| Ethiopian calendar | 413–414 |
| Hebrew calendar | 4181–4182 |
| Hindu calendars | |
| - Vikram Samvat | 477–478 |
| - Shaka Samvat | 343–344 |
| - Kali Yuga | 3522–3523 |
| Holocene calendar | 10421 |
| Iranian calendar | 201 BP – 200 BP |
| Islamic calendar | 207 BH – 206 BH |
| Japanese calendar | |
| Julian calendar | 421 CDXXI |
| Korean calendar | 2754 |
| Minguo calendar | 1491 before ROC 民前1491年 |
| Thai solar calendar | 964 |
| Wikimedia Commons has media related to: 421 |
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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