It is sufficiently known, that the odious appellation of _Tyrant_ was often employed by the ancients to express the illegal seizure of supreme power, without any reference to the abuse of it. Several of the pretenders, who raised the standard of rebellion against the emperor Gallienus, were shining models of virtue, and almost all possessed a considerable share of vigor and ability. Their merit had recommended them to the favor of Valerian, and gradually promoted them to the most important commands of the empire. The generals, who assumed the title of Augustus, were either respected by their troops for their able conduct and severe discipline, or admired for valor and success in war, or beloved for frankness and generosity. The field of victory was often the scene of their election; and even the armorer Marius, the most contemptible of all the candidates for the purple, was distinguished, however, by intrepid courage, matchless strength, and blunt honesty. His mean and recent trade cast, indeed, an air of ridicule on his elevation; * but his birth could not be more obscure than was that of the greater part of his rivals, who were born of peasants, and enlisted in the army as private soldiers. In times of confusion every active genius finds the place assigned him by nature: in a general state of war military merit is the road to glory and to greatness. Of the nineteen tyrants Tetricus only was a senator; Piso alone was a noble. The blood of Numa, through twenty-eight successive generations, ran in the veins of Calphurnius Piso, who, by female alliances, claimed a right of exhibiting, in his house, the images of Crassus and of the great Pompey. His ancestors had been repeatedly dignified with all the honors which the commonwealth could bestow; and of all the ancient families of Rome, the Calphurnian alone had survived the tyranny of the Cæsars. The personal qualities of Piso added new lustre to his race. The usurper Valens, by whose order he was killed, confessed, with deep remorse, that even an enemy ought to have respected the sanctity of Piso; and although he died in arms against Gallienus, the senate, with the emperor’s generous permission, decreed the triumphal ornaments to the memory of so virtuous a rebel.