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[ Tacit. Annal. xv. 48. Hist. i. 15. In the former of these passages we may venture to change paterna into materna. In every generation from Augustus to Alexander Severus, one or more Pisos appear as consuls. A Piso was deemed worthy of the throne by Augustus, (Tacit. Annal. i. 13;) a second headed a formidable conspiracy against Nero; and a third was adopted, and declared Cæsar, by Galba.]
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[ Hist. August. p. 195. The senate, in a moment of enthusiasm, seems to have presumed on the approbation of Gallienus.]
The lieutenants of Valerian were grateful to the father, whom they esteemed. They disdained to serve the luxurious indolence of his unworthy son. The throne of the Roman world was unsupported by any principle of loyalty; and treason against such a prince might easily be considered as patriotism to the state. Yet if we examine with candor the conduct of these usurpers, it will appear, that they were much oftener driven into rebellion by their fears, than urged to it by their ambition. They dreaded the cruel suspicions of Gallienus; they equally dreaded the capricious violence of their troops. If the dangerous favor of the army had imprudently declared them deserving of the purple, they were marked for sure destruction; and even prudence would counsel them to secure a short enjoyment of empire, and rather to try the fortune of war than to expect the hand of an executioner.
When the clamor of the soldiers invested the reluctant victims with the ensigns of sovereign authority, they sometimes mourned in secret their approaching fate. “You have lost,” said Saturninus, on the day of his elevation, “you have lost a useful commander, and you have made a very wretched emperor.” [164]
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[ Hist. August p. 196.]
The apprehensions of Saturninus were justified by the repeated experience of revolutions. Of the nineteen tyrants who started up under the reign of Gallienus, there was not one who enjoyed a life of peace, or a natural death. As soon as they were invested with the bloody purple, they inspired their adherents with the same fears and ambition which had occasioned their own revolt. Encompassed with domestic conspiracy, military sedition, and civil war, they trembled on the edge of precipices, in which, after a longer or shorter term of anxiety, they were inevitably lost. These precarious monarchs received, however, such honors as the flattery of their respective armies and provinces could bestow; but their claim, founded on rebellion, could never obtain the sanction of law or history. Italy, Rome, and the senate, constantly adhered to the cause of Gallienus, and he alone was considered as the sovereign of the empire. That prince condescended, indeed, to acknowledge the victorious arms of Odenathus, who deserved the honorable distinction, by the respectful conduct which he always maintained towards the son of Valerian. With the general applause of the Romans, and the consent of Gallienus, the senate conferred the title of Augustus on the brave Palmyrenian; and seemed to intrust him with the government of the East, which he already possessed, in so independent a manner, that, like a private succession, he bequeathed it to his illustrious widow, Zenobia. [165]