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Birth 421 Birth, Marriage, Death in the UK 421
- 421
- 421
- 421

421
This article is about the year 421. For other uses, see 421 (number).
| 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
v • d • e
|
| Politics |
| State leaders - Sovereign states |
| Birth and death categories |
| Births - Deaths |
| Establishment and disestablishment categories |
| Establishments - Disestablishments |
421 in other calendars
| Gregorian calendar |
421
CDXXI |
| Ab urbe condita |
1174 |
| Armenian calendar |
N/A |
| Bahá'í calendar |
-1423 – -1422 |
| Berber calendar |
1371 |
| 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 |
476 – 477 |
| - 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 |
|
| Korean calendar |
2754 |
| Thai solar calendar |
964 |
|
v • d • e
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- February 8 — Constantius III becomes Co-Emperor of the Western Empire.
- June 7 — Emperor Theodosius II marries Aelia Eudocia, formerly known as Athenais.
- Theodosius declares war on Persia.
- September 2 — Constantius III, Co-Emperor of the Western Roman Empire
- Emperor Gong of Jin China
- Ravina I, a rabbi of the Talmud
- Li Xun
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