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CHAP. X. The Emperors Decius, Gallus, Aemilianus, Valerian, and Gallienus.—The general Irruption of the Bar|barians.—The thirty Tyrants.
FROM the great secular games celebrated by Philip, to the death of the emperor Gallie|nus, there elapsed twenty years of shame and * 1.1 misfortune. During that calamitous period, every instant of time was marked, every province of the Roman world was afflicted, by barbarous in|vaders and military tyrants, and the ruined em|pire seemed to approach the last and fatal mo|ment of its dissolution. The confusion of the times, and the scarcity of authentic memorials, oppose equal difficulties to the historian, who at|tempts to preserve a clear and unbroken thread of narration. Surrounded with imperfect frag|ments, always concise, often obscure, and some|times contradictory, he is reduced to collect, to compare, and to conjecture: and though he ought never to place his conjectures in the rank of facts, yet the knowledge of human nature, and of the sure operation of its fierce and unre|strained passions, might, on some occasions, sup|ply the want of historical materials.
There is not, for instance, any difficulty in conceiving, that the successive murders of so * 1.2 many emperors had loosened all the ties of alle|giance between the prince and people; that all