The ambitious chieftain, having acquired greater power than his neighbors, conceives of further aggrandizement, undertakes new conquests, attacks the weak, and adds other states to his own, till in time he may have made himself a great sovereign and won a great kingdom. These new conquests impose additional cares on the ruler; but he uses the tools of his power to execute his will; he governs his kingdoms with absolute sway, as a general governs his army; it is a military despotism of the simplest structure, and all prerogatives and interests are merged in and subservient to this one. The civil function is not yet developed as distinct from the military. Only one idea pervades the government, and that is the idea of absolute rule by brute force. Society has as yet developed few elements, has but few interests and little functional diversity; there are only two classes, the ruler and the ruled, the masters and the slaves. There being but few political and social interests to play among each other, there cannot be development for want of activity; there can be little progress of any kind. Such are the simple, unprogressive, one-idea governments which prevailed in the earliest times of which we have any tolerably authentic record, and which still prevail among half-civilized peoples. Government is simply a growth, a development, and it must correspond to the character of the people out of whose mental status it has sprung. If the people are homogeneous in their mental structure, their social and political interests must be correspondingly homogeneous and simple. The more rude and primitive the minds of any people, the fewer are the relations external to the individual which obtain among them. But when a people, or a mixture of peoples, have developed great versatility of mind, a great variety of tastes, propensities, aspirations, and interests, their social and political institutions become correspondingly heterogeneous and complex. Such are the social and political systems of Middle and Western Europe. There was nothing of the kind in the ancient world. Then the people were more simple and less versatile in their mental habitudes; and a simple, though despotic government was the inevitable outgrowth. Rome was but a military despotism, and it conquered and ruled with military stringency. It was not till the reign of Diocletian that the civil functions were divorced from the military, and then only to a partial extent. It remained for Constantine to carry out more fully what Diocletian had begun, and to divide, or, if you please, to differentiate the governmental functions to an extent which had been altogether unknown before.