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Rh they were driven by the impulsion of the present power, and as soon as that power yielded to a superior force, they hastened to implore the clemency of the conqueror, who, as he had an immense debt to discharge, was obliged to sacrifice the most guilty countries to the avarice of his soldiers. In the vast extent of the Roman empire there were few fortified cities capable of protecting a routed army; nor was there any person, or family, or order of men, whose natural interest, unsupported by the powers of government, was capable of restoring the cause of a sinking party.

Yet, in the contest between Niger and Severus, a single city deserves an honourable exception. As Byzantium was one of the greatest passages from Europe into Asia, it had been provided with a strong garrison, and a fleet of five hundred vessels was anchored in the harbour. The impetuosity of Severus disappointed this prudent scheme of defence; he left to his generals the siege of Byzantium, forced the less guarded passage of the Hellespont, and, impatient of a meaner enemy, pressed forward to encounter his rival. Byzantium, attacked by a numerous and increasing army, and afterwards by the whole naval power of the empire, sustained a siege of three years, and remained faithful to the name and memory of Niger. The citizens and soldiers (we know not from what cause) were animated with equal fury; several of the principal officers of Niger, who despaired of, or who disdained a pardon, had thrown themselves into this last refuge; the fortifications were esteemed impregnable, and, in the defence of the place, a celebrated engineer displayed all the mechanic powers known to the ancients. Byzantium, at length, surrendered to famine. The magistrates and soldiers were put to the sword, the walls demolished, the privileges suppressed, and the destined capital of the East subsisted only as an open village, subject to the insulting jurisdiction of Perinthus. The historian Dion, who had admired the flourishing, and lamented the desolate, state of Byzantium, accused the revenge of Severus for depriving the