Portrait of Cassius Dio

Cassius Dio

Greco-Roman statesman and historian

Lived
150–235

Updated September 2026

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About Cassius Dio

Lucius Cassius Dio, also known as Dio Cassius, was a Roman historian and senator of maternal Greek origin. He published 80 volumes of the history of ancient Rome, beginning with the arrival of Aeneas in Italy. The volumes documented the subsequent founding of Rome, the formation of the Republic, and the creation of the Empire up until 229 AD, during the reign of Severus Alexander. Written in Koine Greek over 22 years, Dio's work covers approximately 1,000 years of history.

Biography from Wikipedia, CC BY-SA 4.0. Photo via Wikimedia Commons.

Sources: book lists and dates from Wikidata and Open Library, ratings from Open Library readers, free texts from Project Gutenberg. Last updated September 2026.