born c. ad 130, Egypt died July 175
Aspects of this topic are discussed in the following places at Britannica.
...against the Parthian kings, who favoured the neighbouring city of Ctesiphon and founded Vologesias, or Vologesocerta, as a rival canal port. Seleucia eventually was burned by the Roman commander Gaius Avidius Cassius in ad 165, at which time it is said to have had at least 300,000 inhabitants. The destruction of the city marks the end of Hellenism in Mesopotamia. The Roman emperor...
...followed (162–166) was nominally under the command of Verus, though its successful conclusion, with the overrunning of Armenia and Mesopotamia, was the work of subordinate generals, notably Gaius Avidius Cassius. The returning armies brought back with them a plague, which raged throughout the empire for many years and—together with the German invasion—fostered a weakening of...
...of the Four Emperors,” was first proclaimed emperor at Alexandria on July 1, ad 69, in a maneuver contrived by the prefect of Egypt, Tiberius Julius Alexander. Others were less successful. Gaius Avidius Cassius, the son of a former prefect of Egypt, revolted against Marcus Aurelius in ad 175, stimulated by false rumours of Marcus’s death, but his attempted usurpation lasted only...
At Marcus’ very accession the Parthians turned aggressive, and he sent Verus to defend Roman interests (162). Verus greedily took credit for any victories but left serious fighting to Avidius Cassius and the army of Syria. Cassius succeeded in overrunning Mesopotamia and even took Ctesiphon, the Parthian capital; he was therefore able to conclude a peace that safeguarded Rome’s eastern...
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