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 284 the memory of a bridge over the Adda, which, during the action, must have proved an object of the utmost importance to both armies. The Rhætian usurper, after receiving a total defeat and a dangerous wound, retired into Milan. The siege of that great city was immediately formed; the walls were battered with every engine in use among the ancients; and Aureolus, doubtful of his internal strength, and hopeless of foreign succours, already anticipated the fatal consequences of unsuccessful rebellion.

His last resource was an attempt to seduce the loyalty of the besiegers. He scattered libels through their camp, inviting the troops to desert an unworthy master, who sacrificed the public happiness to his luxury, and the lives of his most valuable subjects to the slightest suspicions. The arts of Aureolus diffused fears and discontent among the principal officers of his rival. A conspiracy was formed by Heraclianus, the Prætorian præfect, by Marcian, a general of rank and reputation, and by Cecrops, who commanded a numerous body of Dalmatian guards. The death of Gallienus was resolved, and, notwithstanding their desire of first terminating the siege of Milan, the extreme danger which accompanied every moment's delay obliged them to hasten the execution of their daring purpose. At a late hour of the night, but while the emperor still protracted the pleasures of the table, an alarm was suddenly given that Aureolus, at the head of all his forces, had made a desperate sally from the town; Gallienus, who was never deficient in personal bravery, started from his silken couch, and, without allowing himself time either to put on his armour or to assemble his guards, he mounted on horseback, and rode full speed towards the supposed place of the attack. Encompassed by his declared or concealed enemies, he soon, amidst the nocturnal tumult, received a mortal dart from an uncertain hand. Before he expired, a patriotic sentiment rising in the mind of Gallienus induced him to name a deserving successor, and it was his last request that the Imperial ornaments should be delivered to Claudius, who then commanded a detached army in the neighbourhood of Pavia. The report at least was diligently propagated, and the order cheerfully obeyed by the conspirators, who had already agreed to place Claudius on the throne. On the first news of the emperor's death, the troops