Dio's work is traditionally divided into 80 books, though only a portion survives in its original form.
: Unlike many historians, Dio was a practicing politician. His work often reflects his senatorial biases, particularly his interest in the relationship between the emperor and the Senate. Dio Cassius: Roman History
For detailed research or reading, the following resources are highly recommended: Dio's work is traditionally divided into 80 books,
: Dio frequently critiques the shift from merit-based adoption (like Hadrian's) to hereditary succession, famously noting that the Roman Empire descended from a "kingdom of gold to one of iron and rust" following the reign of Marcus Aurelius. For detailed research or reading, the following resources
Cassius Dio’s Roman History ( Historia Romana ) is a monumental 80-volume work covering approximately 1,000 years, from the legendary arrival of Aeneas in Italy to 229 CE. Writing in Ancient Greek, Dio spent 10 years researching and 12 years composing his history while serving as a high-ranking Roman senator and two-time consul.