It is evident at a glance that this whole institution was from the outset of a military nature.  In the whole detailed scheme we do not encounter a single feature suggestive of any destination of the centuries to other than purely military purposes; and this alone must, with every one accustomed to consider such matters, form a sufficient reason for pronouncing its application to political objects a later innovation.  If, as is probable, in the earliest period every one who had passed his sixtieth year was excluded from the centuries, this has no meaning, so far as they were intended from the first to form a representation of the burgess-community similar to and parallel with the curies.  Although, however, the organization of the centuries was introduced merely to enlarge the military resources of the burgesses by the inclusion of the —­metoeci—­ and, in so far, there is no greater error than to exhibit the Servian organization as the introduction of a timocracy in Rome—­yet the new obligation imposed upon the inhabitants to bear arms exercised in its consequences a material influence on their political position.  He who is obliged to become a soldier must also, so long as the state is not rotten, have it in his power to become an officer; beyond question plebeians also could now be nominated in Rome as centurions and as military tribunes.  Although, moreover, the institution of the centuries was not intended to curtail the political privileges exclusively possessed by the burgesses as hitherto represented in the curies, yet it was inevitable that those rights, which the burgesses hitherto had exercised not as the assembly of curies, but as the burgess-levy, should pass over to the new centuries of burgesses and —­metoeci—.  Henceforward, accordingly, it was the centuries whose consent the king had to ask before beginning an aggressive war.(11) It is important, on account of the subsequent course of development, to note these first steps towards the centuries taking part in public affairs; but the centuries came to acquire such rights at first more in the way of natural sequence than of direct design, and subsequently to the Servian reform, as before, the assembly of the curies was regarded as the proper burgess-community, whose homage bound the whole people in allegiance to the king.  By the side of these new landowning full-burgesses stood the domiciled foreigners from the allied Latium, as participating in the public burdens, tribute and task-works (hence -municipes-); while the burgesses not domiciled, who were beyond the pale of the tribes, and had not the right to serve in war and vote, came into view only as “owing tribute” (-aerarii-).

In this way, while hitherto there had been distinguished only two classes of members of the community, burgesses and clients, there were now established those three political classes, which exercised a dominant influence over the constitutional law of Rome for many centuries.