| Millennium: | 1st millennium BC |
|---|---|
| Centuries: | 2nd century BC - 1st century BC - 1st century |
| Decades: | 50s BC 40s BC 30s BC - 20s BC - 10s BC 0s BC 0s |
| Years: | 23 BC 22 BC 21 BC - 20 BC - 19 BC 18 BC 17 BC |
| 20 BC by topic | |
| Politics | |
| State leaders - Sovereign states | |
| Birth and death categories | |
| Births - Deaths | |
| Establishments and disestablishments categories | |
| Establishments - Disestablishments | |
| Gregorian calendar | 20 BC |
| Ab urbe condita | 734 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1863 – -1862 |
| Berber calendar | 931 |
| Buddhist calendar | 525 |
| Burmese calendar | -657 |
| Byzantine calendar | 5489 – 5490 |
| Chinese calendar | 庚子年 (2617/2677) — to —
辛丑年(2618/2678) |
| Coptic calendar | -303 – -302 |
| Ethiopian calendar | -27 – -26 |
| Hebrew calendar | 3741 – 3742 |
| Hindu calendars | |
| - Vikram Samvat | 36 – 37 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 3082 – 3083 |
| Holocene calendar | 9981 |
| Iranian calendar | 641 BP – 640 BP |
| Islamic calendar | 661 BH – 660 BH |
| Japanese calendar | |
| Korean calendar | 2314 |
| Thai solar calendar | 524 |
Year 20 BC was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar.
Events
By place
India
Rome
- Peace treaty between Rome and Parthia, in which the captured eagles of Crassus and Mark Antony are returned.
- Based on the scenes and the style of the work, the Portland Vase is believed to have been made in Alexandria some time between this year and 100 AD.
- King Herod the Great begins renovation of the Temple in Jerusalem.
- Maison Carrée, Nîmes, France, is built (approximate date).
Births
- Gaius Caesar, grandson of Augustus Caesar (d. AD 4)
- Philo, the philosopher (approximate date) (d. AD 50)
Deaths
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