In 175, after hearing false reports that Marcus Aurelius had succumbed to his severe illness, Cassius declared himself emperor, claiming that Aurelius' troops in
Pannonia, where he had been leading troops as a part of the
Marcomannic War, had elected him emperor. Some versions say that Cassius was tricked, or persuaded, by
Faustina the Younger, who was the wife of Aurelius, because she feared that Aurelius would die while
Commodus, their son, was still young, a situation which would likely have led to a usurper seizing the throne for himself. According to these accounts, Faustina thus tricked, or persuaded, Cassius into rebelling, to ensure the next emperor was someone of her choosing. The exact date of his revolt is unknown, although it is known that he revolted by at least 3 May, due to a document about his emperorship from that date. A papyrus from the
Oxyrhynchus Papyri has shown that Cassius was confident of Egyptian support as early as April or even March. Aurelius attempted to suppress news of the revolt, but, when it became widespread throughout his camp, chose to address it in a speech. The exact wording of his speech is unknown, as the record given by Cassius Dio is believed to be a free composition, which followed only the outline of Aurelius' actual speech. In the record, Aurelius laments the betrayal of a dear friend, and says that if the danger had been to him alone, he would be willing to "set the issue" between himself and Cassius, before the
Senate and the
Army, and would have yielded the empire to Cassius, if the senate and army considered him the better leader. He was also recorded as saying that he hoped that Cassius would not be killed or commit suicide, so that he could show mercy. The
Historia Augusta, a work both treasured by historians and notorious for its falsehoods, records that Aurelius formed a peace commission among his advisors. Cassius started the rebellion in a good position. He received large support from the Eastern provinces, especially his homeland of Syria, due to a combination of his distant royal descent, his victories in the Parthian War and the Bucolic War. He received support from the provinces of Egypt, Syria,
Syria Palaestina and
Arabia Petraea, giving him a potential strength of seven legions: three from Syria, two from Syria Palaestina, one from Roman Arabia, and one from Egypt. Cassius set his base of operations in Egypt, with two important bases outside of Egypt being
Antioch and
Cyrrhus, both important military centres.
Gaius Calvisius Statianus, the contemporary
prefect of Egypt, issued an edict, which has survived in a fragmentary state, ordering the populace of Egypt to rejoice at the accession of Cassius. Despite controlling some of the most important parts of the Roman East, especially Egypt which was a critical supplier of grain for the city of Rome, Cassius failed to win widespread support for his rebellion. The Roman Senate swiftly declared Cassius a public enemy, and
Publius Martius Verus, the governor of
Cappadocia, who staunchly opposed the rebellion, rallied public support for Aurelius. Cassius, through the marriage of his daughter,
Avidia Alexandra, to
Titius Claudius Dryantianus Antonius, had connection to the
Licinnii of
Lycia, including Claudius Dryantianus's father
Tiberius Claudius Agrippinus, who was a
consul. The aristocratic Licinnii are one of the most well known Lycian families. It is unknown how much of a role Claudius Dryantianus played, although it is known that some considered him to be Cassius' partner in crime. Claudius Dryantianus and Avidia Alexandra were pardoned by Marcus Aurelius, although Claudius Dryantianus' estate was confiscated after his death. Many nobles throughout the empire opposed the rebellion, one example being
Herodes Atticus, who is recorded as having sent Cassius a letter containing only the word
emanes, literally "you are mad". Despite this widespread opposition, the capital of Rome was thrown into a panic, which forced Aurelius to send
Gaius Vettius Sabinianus Julius Hospes, the governor of
Pannonia Inferior, with troops to secure the city. Aurelius was forced to withdraw from his campaign against the
Iazyges, and end the
Marcomannic War. Several barbarian tribes sent offers of their assistance to Aurelius, all of which were refused. Aurelius amassed troops and prepared to depart for the East, to depose Cassius. It was soon clear that Aurelius was in a stronger position, with far more legions available to him than to Cassius. When news of Aurelius' plans to invade reached Egypt, a centurion killed Cassius, and sent his head to Aurelius, who refused to see it, and ordered it buried. He was likely killed by at least the end of July 175, as Egypt chose to recognize Aurelius again on 28 July 175. Cassius had rebelled for three months and six days before being killed, during which time no coins were struck bearing his image.
Aftermath After the death of Cassius, Publius Martius Verus swiftly took control of Syria, and burned all of Cassius' correspondences. Even after the news of Cassius' death had reached Marcus Aurelius, Aurelius was still determined to visit the east. He set off with a body of advisors, along with his wife, Faustina, who died along the way, in a village in south Cappadocia, about south of
Tyana, called Halala. The town was
renamed in her honor, and his son, Commodus. After the death of Faustina, Aurelius wrote to the Senate, asking them for a report on Cassius' supporters, but specifically saying he desired no bloodshed to punish them, as several retributions had already been carried out in the name of Aurelius. Among these were the killing of
Avidius Maecianus, a son of Cassius. Aurelius ordered the banishment of
Avidius Heliodorus, another son of Cassius.
Avidia Alexandra, the daughter of Cassius, and her husband, were placed under the protection of "an uncle by marriage", believed to be
Claudius Titianus, a
Lycian senator. ==Personal life==