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the deplorable reigns of Valerian and Gallienus, the empire was oppressed and almost destroyed by the soldiers, the tyrants, and the barbarians. It was saved by a series of great princes, who derived their obscure origin from the martial provinces of Illyricum. Within a period of about thirty years, Claudius, Aurelian, Probus, Diocletian and his colleagues, triumphed over the foreign and domestic enemies of the state, re-established, with the military discipline, the strength of the frontiers, and deserved the glorious title of Restorers of the Roman world.

The removal of an effeminate tyrant made way for a succession of heroes. The indignation of the people imputed all their calamities to Gallienus, and the far greater part were, indeed, the consequence of his dissolute manners and careless administration. He was even destitute of a sense of honour, which so frequently supplies the absence of public virtue; and, as long as he was permitted to enjoy the possession of Italy, a victory of the barbarians, the loss of a province, or the rebellion of a general, seldom disturbed the tranquil course of his pleasures. At length, a considerable army, stationed on the Upper Danube, invested with the Imperial purple their leader Aureolus; who, disdaining a confined and barren reign over the mountains of Rhætia, passed the Alps, occupied Milan, threatened Rome, and challenged Gallienus to dispute in the field the sovereignty of Italy. The emperor, provoked by the insult, and alarmed by the instant danger, suddenly exerted that latent vigour which sometimes broke through the indolence of his temper. Forcing himself from the luxury of the palace, he appeared in arms at the head of his legions, and advanced beyond the Po to encounter his competitor. The corrupted name of Pontirolo still preserves