21 BC
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| Millennium |
| 1st millennium BC |
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| 21 BC by topic |
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| Arts, history, and science |
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| Lists of leaders |
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| Gregorian calendar | 21 BC XX BC |
| Ab urbe condita | 733 |
| Ancient Greek era | 189th Olympiad, year 4 |
| Assyrian calendar | 4730 |
| Balinese saka calendar | N/A |
| Bengali calendar | −613 |
| Berber calendar | 930 |
| Buddhist calendar | 524 |
| Burmese calendar | −658 |
| Byzantine calendar | 5488–5489 |
| Chinese calendar | 己亥年 (Earth Pig) 2676 or 2616 — to — 庚子年 (Metal Rat) 2677 or 2617 |
| Coptic calendar | −304 – −303 |
| Discordian calendar | 1146 |
| Ethiopian calendar | −28 – −27 |
| Hebrew calendar | 3740–3741 |
| Hindu calendars | |
| - Vikram Samvat | 36–37 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 3080–3081 |
| Holocene calendar | 9980 |
| Iranian calendar | 642 BP – 641 BP |
| Islamic calendar | 662 BH – 661 BH |
| Javanese calendar | N/A |
| Julian calendar | 21 BC XX BC |
| Korean calendar | 2313 |
| Minguo calendar | 1932 before ROC 民前1932年 |
| Nanakshahi calendar | −1488 |
| Seleucid era | 291/292 AG |
| Thai solar calendar | 522–523 |
| Tibetan calendar | ས་མོ་ཕག་ལོ་ (female Earth-Boar) 106 or −275 or −1047 — to — ལྕགས་ཕོ་བྱི་བ་ལོ་ (male Iron-Rat) 107 or −274 or −1046 |
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Year 21 BC was either a common year starting on Monday, Tuesday or Wednesday or a leap year starting on Tuesday of the Julian calendar. At the time, it was known as the Year of the Consulship of Lollius and Lepidus.
Events
- Marcus Vipsanius Agrippa divorces Claudia Marcella. He then marries Julia the Elder, daughter of Caesar Augustus.
Births
- Naevius Sutorius Macro, Roman politician (d. AD 38)