421
| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 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 |
庚申年 (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 |
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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