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Dio Cassius passed the greater part of his life in public service. He was a senator under Commodus and governor of Smyrna after the death of Septimius Severus; and afterwards suffect consul around 205, as also proconsul in Africa and Pannonia. Alexander Severus entertained the highest esteem for him, and made him consul for the second time, with himself in 229, though the Praetorian Guards, irritated against him on account of his severity, had demanded his life. Following his second consulship, being advanced in years, he returned to his native country, where he died.

Dio published a Roman history, in eighty books, the fruit of his researches and labours of twenty-two years. It embraced a period of 983 years, extending from the arrival of Aeneas in Italy, and the subsequent founding of Rome, to AD 229. Down to the time of Julius CaesarAlternative meanings: Julius Caesar (disambiguation). Gaius Julius Caesar ( Latin: C·IVLIVS·C·F·C·N·CAESAR) ( July 13, 100 BC March 15, 44 BC) was a Roman military and political leader whose conquest of Gallia Comata extended the Roman world all the way t, he only gives a summary of events; after this, he enters somewhat more into details; and from the time of Commodus he is very circumstantial in relating what passed under his own eyes. We have fragments remaining of the first thirty-six books: but there is a considerable portion of the thirty-fifth book, on the war of LucullusLucius Licinius Lucullus was a consul of ancient Rome, a supporter of Sulla and victor in the East. He was a grandson of the consul Lucius Licinius Lucullus, and a nephew of Quintus Caecilius Metellus Numidicus. Initially serving in the Social War under S against MithridatesMithridates VI of Pontus ( 132 BC- 63 BC), called Eupator Dionysius was the king of Pontus in Asia Minor and one of Rome's most formidable and successful enemies. Mithridates was the son of Mithridates V of Pontus, called Euergetes. Mithridates spent much, and of the thirty-sixth, on the war with the pirates and the expedition of Pompey against the king of Pontus. The books that follow, to the fifty-fourth inclusive, are nearly all complete: they cover the period from 65 BCCenturies: 2nd century BC 1st century BC 1st century Decades: 110s BC 100s BC 90s BC 80s BC 70s BC 60s BC 50s BC 40s BC 30s BC 20s BC 10s BC Years: 70 BC 69 BC 68 BC 67 BC 66 BC 65 BC 64 BC 63 BC 62 BC 61 BC 60 BC Events In response to the illegal exercis to 12 BCCenturies: 2nd century BC 1st century BC 1st century Decades: 60s BC 50s BC 40s BC 30s BC 20s BC 10s BC 0s 10s 20s 30s 40s Years: 17 BC 16 BC 15 BC 14 BC 13 BC 12 BC 11 BC 10 BC 9 BC 8 BC 7 BC Events Comet Halley makes an appearance Births Marcus Valerius, or from the eastern campaign of Pompey and the death of Mithridates to the death of Marcus Vipsanius AgrippaMarcus Vipsanius Agrippa ( 63 BC- 12 BC) was a Roman statesman and general, son-in-law and minister of the emperor Caesar Augustus. He is best known for winning the naval Battle of Actium against the forces of Marcus Antonius and Cleopatra. Agrippa was of. The fifty-fifth book has a considerable gap in it. The fifty-sixth to the sixtieth, both included, which comprehend the period from AD 9Centuries: 1st century BC 1st century 2nd century Decades: 40s BC 30s BC 20s BC 10s BC 0s BC 0s 10s 20s 30s 40s 50s Years: 4 5 6 7 8 9 10 11 12 13 14 Events Wang Mang founds the short-lived Xin Dynasty in China (until A. Illyria is turned into a province to 54Alternate uses, see Number 54 Centuries: 1st century BC 1st century 2nd century Decades: 0s 10s 20s 30s 40s 50s 60s 70s 80s 90s 100s Years: 49 50 51 52 53 54 55 56 57 58 59 Events October 13 Roman Empire emperor Claudius dies after being poisoned by Agrip, are complete, and contain the events from the defeat of Varus in Germany to the death of Claudius. Of the following twenty books we have only fragments and the meagre abridgment of John Xiphilinus, a monk of the eleventh century. The eightieth or last book comprehends the period from 222 to 229, in the reign of Alexander Severus. The abridgment of Xiphilinus, as now extant, commences with the thirty-fifth and continues to the end of the eightieth book. It is a very indifferent performance, and was made by order of the emperor Michael VII Parapinaces.

The fragments of the first thirty-six books, as now collected, are of four kinds:

1. Fragmenta Valesiana, such as were dispersed throughout various writers, scholiasts, grammarians, lexicographers, etc., and were collected by Henri de Valois.
2. Fragmenta Peiresciana, comprising large extracts, found in the section entitled “Of Virtues and Vices,” in the great collection or portative library compiled by order of Constantine VII Porphyrogenitus. The manuscript of this belonged to Peiresc.
3. The fragments of the first thirty-four books, preserved in the second section of the same work of Constantine's, entitled “Of Embassies.” These are known under the name of Fragmenta Ursiniana, because the manuscript containing them was found in Sicily by Fulvio Orsini.
4. Excerpta Vaticana, by Mai, which contain fragments of books one to thirty-five, and sixty-one to eighty. To these are added the fragments of an unknown continuator of Dio, which go down to the time of Constantine. Other fragments from Dio belonging chiefly to the first thirty-five books were found by Mai in two Vatican MSS., which contain a collection made by Maximus Planudes. The annals of Joannes Zonaras also contain numerous extracts from Dio.

Dio has taken Thucydides for his model, but the imitator is not comparable with his original either in arrangement and the distribution of materials or in soundness of view and accurate reasoning. His style is generally clear, where there appears to be no corruption of the text, though full of Latinisms. His diligence is unquestionable, and, from his opportunities, he was well acquainted with the circumstances of the Empire during the period for which he is a contemporary authority.

This entry was based on H. T. Peck's Harpers Dictionary of Classical Antiquities (1898)