Flavius Josephus, The Wars of the Jews
William Whiston, A.M., Ed.

[4] Now at the time when this great concussion of affairs happened, the affairs of the Romans were themselves in great disorder. Those Jews also who were for innovations, then arose when the times were disturbed; they were also in a flourishing condition for strength and riches, insomuch that the affairs of the East were then exceeding tumultuous, while some hoped for gain, and others were afraid of loss in such troubles; for the Jews hoped that all of their nation which were beyond Euphrates would have raised an insurrection together with them. The Gauls also, in the neighborhood of the Romans, were in motion, and the Geltin were not quiet; but all was in disorder after the death of Nero. And the opportunity now offered induced many to aim at the royal power; and the soldiery affected change, out of the hopes of getting money. I thought it therefore an absurd thing to see the truth falsified in affairs of such great consequence, and to take no notice of it; but to suffer those Greeks and Romans that were not in the wars to be ignorant of these things, and to read either flatteries or fictions, while the Parthians, and the Babylonians, and the remotest Arabians, and those of our nation beyond Euphrates, with the Adiabeni, by my means, knew accurately both whence the war begun, what miseries it brought upon us, and after what manner it ended.