Under the sceptre of the imperial unity were brought together a hundred different lands occupied by as many different races. That rule of Rome which had grown for many centuries with out, as it seemed, any presiding thought, by the casual accretions of conquest, may be said to assume under the hands of Augustus, about the year of Rome 750, certain definite and deliberately chosen limits, and to be governed by a fixed Idea, more and more developed in the imperial policy. The limits which the most fortunate of Roman emperors, nay the creator of the empire itself, put to it, were the Rhine and Danube, with the Euxine Sea, on the north; the deserts of Africa on the south; the Euphrates on the east; the ocean on the west. The Idea, which may indeed have been conceived by Julius, but was certainly first embodied by Augustus, was to change the constitution of a conquering city, ruled by an aristocratic senate, into a commonwealth governed by one man, the representative of the whole people; and the effect of this change, an effect no doubt unforeseen, at least in its extent, by its framer, was gradually to absorb the manifold races inhabiting these vast regions into the majesty of the Roman law, order, and citizenship. The three centuries which follow Augustus are occupied in working out the drama of this unity. During this time the provinces appear to come out more and more as parts of one whole. Some which at its commencement had only just entered the circle of Roman power and thought, as Gaul, become entirely interpenetrated with the law, language, customs, and civilisation of the sovereign city. Spain was nearly as much, and northern Africa perhaps even more Latinised: in all, local inequalities, and the dissimilarity arising from conflicting races, customs, and languages, are more and more softened down, though never entirely removed; and while throughout this period the great city continues the head, yet the body assumes an ever-increasing importance, until at length its members engage the equal solicitude of that central potentate to whom all equally belong. In the times of so-called Roman liberty, the plunder of lands which received pro-consuls for their annual rulers, served to replenish the fortunes of nobles exhausted by the corruption requisite to gain high office; but if the dominion of one at Rome seemed an evil exchange to a nobility which deemed itself born to enjoy a conquered world, at least it served as a protection to those many millions for whom the equality of law and order, the fair administration of justice, and the undisturbed possession of property, constituted the chief goods of life. Cicero and his peers might grieve over the extinction of what they termed liberty, but Gaul, Spain, Africa, and Asia exulted in deliverance from the oppression of a Verres, a Fonteius, a Gabinius, a Piso, or a Clodius, in the communication of citizenship, and in the peace of a common civilisation.