But plebeian distress was probably not the sole, perhaps not the primary, factor in the convulsion. All along, the process of inequality had gone on among plebeians and patricians alike, some of the former rising to wealth and some of the latter sinking to relative poverty. Thus arises in effect the struggle of a "middle class" to share the political and social privileges of the "upper"; and there is reason to think that the Etruscan conquest was furthered by rich plebeians as against the patricians. The new constitution was what the Greeks called a "timocracy," or "rule of property"; and though in respect of the _comitia centuriata_ plebeians were admitted to the franchise, it was under such provisions as to voting that the richer classes easily held the balance of power.[36] At the same time the patricians retained the religious power of the old kings, as custodians of the ritual mysteries--a great source of dominion. Thus the crisis was only temporarily relieved, and the struggle was renewed again and again, both under and after the kings. We can broadly divine that the anti-patrician rule of the king, who would rely on the plebs, unified against him the patricians or "free" citizens, who sought to keep down the masses; while, on the other hand, the increasing outlaw plebs was unified by its sheer need.[37] As to the rule of the kings, whether native or Etruscan, no exact knowledge is now possible. We can but trace some of their functions in certain constitutional forms. Thus the Senate, or Council of the Elders, appears to have been the council of the king, selected by him, but capable of nominating his successor.[38] Whatever were its original function, it became in time the supreme power in the State, growing alike in numbers and in power, overruling or eclipsing the _comitia curiata_, _comitia centuriata_, and other bodies in which the general mass, first of patrician citizens and later of enfranchised plebeians, were enrolled.[39] But it is not through the complicated archæology of the Roman constitution, latterly compiled with such an infinity of scholarly labour, that the nature of Roman evolution is really to be known. The technique of the system resulted from an endless process of compromise among social forces; and it is in the actual clash and play of those forces, as revealed in the simple records, that the human significance of it all is to be felt. In this way we substitute for a vague and false conception of unitary growth one of perpetual strife of classes, interests, and individualities.