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| Centuries: | 2nd century BC - 1st century BC - 1st century |
| Decades: | 70s BC 60s BC 50s BC - 40s BC - 30s BC 20s BC 10s BC |
| Years: | 51 BC 50 BC 49 BC - 48 BC - 47 BC 46 BC 45 BC |
| 48 BC by topic | |
| Politics | |
| State leaders - Sovereign states | |
| Birth and death categories | |
| Births - Deaths | |
| Establishments and disestablishments categories | |
| Establishments - Disestablishments | |
| Gregorian calendar | 48 BC |
| Ab urbe condita | 706 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1891 – -1890 |
| Berber calendar | 903 |
| Buddhist calendar | 497 |
| Burmese calendar | -685 |
| Byzantine calendar | 5461 – 5462 |
| Chinese calendar | 壬申年 (2589/2649) — to —
癸酉年(2590/2650) |
| Coptic calendar | -331 – -330 |
| Ethiopian calendar | -55 – -54 |
| Hebrew calendar | 3713 – 3714 |
| Hindu calendars | |
| - Vikram Samvat | 8 – 9 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 3054 – 3055 |
| Holocene calendar | 9953 |
| Iranian calendar | 669 BP – 668 BP |
| Islamic calendar | 690 BH – 689 BH |
| Japanese calendar | |
| Korean calendar | 2286 |
| Thai solar calendar | 496 |
Year 48 BC was a year of the pre-Julian calendar.
Events
By place
Rome
- Consuls: Gaius Julius Caesar, Publius Servilius Vatia Isauricus.
- Civil War:
- January 4 — Caesar lands at Dyrrhachium (Durazzo).
- March — Mark Antony joins Caesar.
- April — Siege of Dyrrhachium.
- May — Publius Servilius Vatia Isauricus, co-consul with Julius Caesar, destroys Caelius's magistrate's chair on his tribunal.
- July 10 — Battle of Dyrrhachium, Julius Caesar barely avoids a catastrophic defeat to Pompey in Macedonia; he retreats to Thessaly.
- August 9 — Battle of Pharsalus: Caesar decisively defeats Pompey at Pharsalus and Pompey flees to Egypt. Pompey's army by and large pardoned.
- September 28 — Pompey the Great is assassinated on orders of King Ptolemy of Egypt after landing in Egypt (may have occurred September 29, records unclear).
- Caesar is named consul for a period of five years.
- Roman temple to Bellona on the Capitolinus outside Rome is burnt to the ground.
- Siege of Alexandria.
- October — Pharnaces, King of Bosporus defeats the Caesarian Domitius Calvinus in the Battle of Nicopolis (or Nikopol).
- December — Battle in Alexandria, Egypt between the forces of Caesar and his ally Cleopatra VII of Egypt and those of rival King Ptolemy XIII of Egypt and Queen Arsinoe IV. The latter two are defeated and flee the city, but during the battle part of the Library of Alexandria catches fire and is burned down.
Asia
- Yuan becomes emperor of the Han Dynasty.
Births
- Lucius Calpurnius Piso, consul under Caesar Augustus
- Consort Ban, Chinese concubine of Emperor Cheng of Han, also a female poet and scholar (d. 6 BC)
Deaths
- September 28 — Pompey, Roman politician (assassinated)
- Titus Annius Milo, Roman politician (died in exile)
