3 BC
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| Millennium |
| 1st millennium BC |
| Centuries |
| Decades |
| Years |
| 3 BC by topic |
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| Arts, history, and science |
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| Countries |
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| Lists of leaders |
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| Birth and death categories |
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| Establishments and disestablishments categories |
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| Works category |
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| Gregorian calendar | 3 BC II BC |
| Ab urbe condita | 751 |
| Ancient Greek era | 194th Olympiad, year 2 |
| Assyrian calendar | 4748 |
| Balinese saka calendar | N/A |
| Bengali calendar | −595 |
| Berber calendar | 948 |
| Buddhist calendar | 542 |
| Burmese calendar | −640 |
| Byzantine calendar | 5506–5507 |
| Chinese calendar | 丁巳年 (Fire Snake) 2694 or 2634 — to — 戊午年 (Earth Horse) 2695 or 2635 |
| Coptic calendar | −286 – −285 |
| Discordian calendar | 1164 |
| Ethiopian calendar | −10 – −9 |
| Hebrew calendar | 3758–3759 |
| Hindu calendars | |
| - Vikram Samvat | 54–55 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 3098–3099 |
| Holocene calendar | 9998 |
| Iranian calendar | 624 BP – 623 BP |
| Islamic calendar | 643 BH – 642 BH |
| Javanese calendar | N/A |
| Julian calendar | 3 BC II BC |
| Korean calendar | 2331 |
| Minguo calendar | 1914 before ROC 民前1914年 |
| Nanakshahi calendar | −1470 |
| Seleucid era | 309/310 AG |
| Thai solar calendar | 540–541 |
| Tibetan calendar | མེ་མོ་སྦྲུལ་ལོ་ (female Fire-Snake) 124 or −257 or −1029 — to — ས་ཕོ་རྟ་ལོ་ (male Earth-Horse) 125 or −256 or −1028 |
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Year 3 BC was a common year starting on Wednesday or Thursday of the Julian calendar. At the time, it was known as the Year of the Consulship of Lentulus and Messalla.
Events
- King Maroboduus of the Marcomanni made a confederation of Germanic tribes, with the Hermunduri, Lombards, Semnoni and Vandals.
- Lucius Domitius Ahenobarbus leads the Roman army in Germania and crossed the Elbe
Births
- Seneca, Roman statesman (d. AD 65)
- Servius Sulpicius Galba, Roman Emperor (d. AD 69)
Deaths
- Imperial consort Fu of the Chinese Han Dynasty