| Millennium: | 1st millennium |
|---|---|
| Centuries: | 4th century – 5th century – 6th century |
| Decades: | 390s 400s 410s – 420s – 430s 440s 450s |
| Years: | 417 418 419 – 420 – 421 422 423 |
| 420 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 420 CDXX |
| Ab urbe condita | 1173 |
| Armenian calendar | N/A |
| Assyrian calendar | 5170 |
| Bahá'í calendar | -1424–-1423 |
| Bengali calendar | -173 |
| Berber calendar | 1370 |
| English Regnal year | N/A |
| Buddhist calendar | 964 |
| Burmese calendar | -218 |
| Byzantine calendar | 5928–5929 |
| Chinese calendar | 己未年十一月三十日 (3056/3116-11-30) — to —
庚申年十一月十一日(3057/3117-11-11) |
| Coptic calendar | 136–137 |
| Ethiopian calendar | 412–413 |
| Hebrew calendar | 4180–4181 |
| Hindu calendars | |
| - Vikram Samvat | 476–477 |
| - Shaka Samvat | 342–343 |
| - Kali Yuga | 3521–3522 |
| Holocene calendar | 10420 |
| Iranian calendar | 202 BP – 201 BP |
| Islamic calendar | 208 BH – 207 BH |
| Japanese calendar | |
| Julian calendar | 420 CDXX |
| Korean calendar | 2753 |
| Minguo calendar | 1492 before ROC 民前1492年 |
| Thai solar calendar | 963 |
| Wikimedia Commons has media related to: 420 |
Year 420 (CDXX) was a leap year starting on Thursday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Theodosius and Constantius (or, less frequently, year 1173 Ab urbe condita). The denomination 420 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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