# Cassius Dio

> Greco-Roman statesman and historian (c. 155–c. 235)

**Wikidata**: [Q185223](https://www.wikidata.org/wiki/Q185223)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Cassius_Dio)  
**Source**: https://4ort.xyz/entity/cassius-dio

## Summary
Cassius Dio was a Greco-Roman statesman and historian, active during the late Roman Empire (c. 155–c. 235). He is best known as the author of *Roman History*, a monumental work that provides critical insights into the political and military events of his time, particularly the reign of Emperor Marcus Aurelius.

## Biography
- Born: c. 155 (exact location unknown)
- Nationality: Roman (of Greek descent)
- Education: Unknown (no records of formal education)
- Known for: Authoring *Roman History*, a foundational text on Roman history
- Employer(s): Served in the Roman military and political administration
- Field(s): History, politics, military personnel

## Contributions
- *Roman History* (c. 230): A 80-book history of Rome, covering events from the founding of the city to the reign of Marcus Aurelius. The work remains a primary source for understanding Roman history, though only fragments survive today.

## FAQs
- **What was Cassius Dio's primary occupation?**
  Cassius Dio was a historian and statesman, serving in both military and political roles during the late Roman Empire.

- **What is Cassius Dio best known for?**
  He is best known as the author of *Roman History*, a comprehensive work that provides historical context for the reign of Emperor Marcus Aurelius.

- **Where did Cassius Dio work?**
  He served in the Roman military and political administration, though specific roles are not detailed in the source material.

## Why They Matter
Cassius Dio's *Roman History* is one of the most important historical works of the ancient world, offering critical insights into Roman governance, military campaigns, and political intrigue. While only fragments survive, his work remains a foundational text for understanding the late Roman Empire. His historical contributions influenced later scholars, including medieval and Renaissance historians, who relied on his accounts to reconstruct Roman history.

## Notable For
- Author of *Roman History*, a key source for Roman history
- Served in the Roman military and political administration
- His work shaped medieval and Renaissance historical scholarship

## Body
### Early Life and Background
Cassius Dio was born around 155 and was of Greek descent, reflecting the multicultural nature of the late Roman Empire. Little is known about his early life, but he likely came from a family with connections to Roman society, possibly through military or administrative service.

### Career and Historical Work
Cassius Dio served in the Roman military and political administration, though specific roles are not detailed. His primary contribution was *Roman History*, a monumental 80-book work that covered Roman history from its founding to the reign of Marcus Aurelius. The work is divided into two parts: the first 40 books focus on the early Republic, while the latter 40 detail the late Republic and early Empire, including the reign of Marcus Aurelius.

### Influence and Legacy
Cassius Dio's *Roman History* remains a critical primary source for understanding the late Roman Empire. While only fragments survive, his work was widely cited by medieval and Renaissance historians, who used his accounts to reconstruct Roman history. His historical contributions laid the groundwork for later scholarly interpretations of Roman governance and military campaigns.

### Historical Significance
Cassius Dio's work provides invaluable insights into the political and military events of his time, particularly the reign of Marcus Aurelius. His detailed accounts of Roman governance and military strategies continue to be studied by historians, offering a window into the complexities of the late Roman Empire.

## References

1. EEBE / Dion, Cassius
2. Dio
3. BnF authorities
4. Encyclopædia Britannica Online
5. Encyclopædia Universalis
6. Gran Enciclopèdia Catalana
7. Great Aragonese Encyclopedia
8. Great Russian Encyclopedia
9. Encyclopædia Iranica
10. Orthodox Encyclopedia
11. Treccani's Enciclopedia on line
12. Integrated Authority File
13. datos.bne.es
14. International Standard Name Identifier
15. CiNii Research
16. Virtual International Authority File
17. Isidore
18. Nationalencyklopedin
19. British Museum person-institution thesaurus
20. Library of Congress Name Authority File
21. World History Encyclopedia
22. Freebase Data Dumps. 2013
23. CONOR.SI
24. CERL Thesaurus
25. Enciclopedia Treccani
26. LIBRIS. 2012
27. Dizionario di Storia
28. Bibliography of the History of the Czech Lands
29. Provenio
30. Clavis Historicorum Antiquitatis Posterioris
31. Digital Scriptorium Catalog