“In that age, the art of fortification, and the principles of tactics, were well understood by all the Roman generals; and the constant superiority of Severus was that of an artist, who uses the same instruments with more skill and industry than his rivals. I shall not, however, enter into a minute narrative of these military operations; but as the two civil wars against Niger and against Albinus were almost the same in their conduct, event, and consequences, I shall collect into one point of view the most striking circumstances, tending to develop the character of the conqueror and the state of the empire.
Falsehood and insincerity, unsuitable as they seem to the dignity of public transactions, offend us with a less degrading idea of meanness, than when they are found in the intercourse of private life. In the latter, they discover a want of courage; in the other, only a defect of power: and, as it is impossible for the most able statesmen to subdue millions of followers and enemies by their own personal strength, the world, under the name of policy, seems to have granted them a very liberal indulgence of craft and dissimulation. Yet the arts of Severus cannot be justified by the most ample privileges of state reason. He promised only to betray, he flattered only to ruin; and however he might occasionally bind himself by oaths and treaties, his conscience, obsequious to his interest, always released him from the inconvenient obligation.”
-Edward Gibbon, The Decline and Fall of the Roman Empire Chp. V Part II