Contrary to Appian, whose longest work shares the title of this of historian's magnum opus, this man reported that Mithridates VI was murdered after immunity to poison thwarted a suicide attempt.
This man's extant work is fragmentary, and most of the final half is only known through the eleventh-century epitome of Joannes Xiphilinus. One section of his main text was collected into the Fragmenta Valesiana by Henri de Valois. Contrary to Appian, whose longest work shares the title of this of historian's magnum opus, this man reported that Mithridates VI was murdered after immunity to poison thwarted a suicide attempt. The most complete book of this man's work is the thirty-sixth, which details Pompey's expeditions against the pirates and Pontus. This historian was an eyewitness to the speech delivered by Septimius Severus after the latter overthrew Julian, as this man was a senator at the time. His history ends with the death of Heliogabalus and is written in Greek in the style of Thucydides. For 10 points, name this author of the eighty-volume Roman History, a Roman historian who came just after Tacitus and Suetonius.
This man's extant work is fragmentary, and most of the final half is only known through the eleventh-century epitome of Joannes Xiphilinus.
Cassius Dio [or Lucius Cassius Dio Cocceianus; or Claudius Cassius Dio Cocceianus; or Dio Cassius]