Cassius Dio (c. 164 - c. 229/235 CE) was a Roman politician and historian. Although he held a number of political offices with distinction, he is best known for his 80-volume Roman History. The work took 22 years to complete, was written in Attic Greek, and follows Roman history from the city's foundation to the reign of Alexander Severus (r. 222-235 CE). Unfortunately, only one-third of Cassius Dio's Roman History survives, the best-preserved part being the period 69 BCE - 46 CE.
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Definition
Timeline
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c. 164 CE - c. 235 CELife of Roman historian Cassius Dio.
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c. 202 CECassius Dio begins work on his 'Roman History'.