Under the Republic, the curiae, still confined to the four urban tribes, and including only the populace of Rome, suited neither the senate, which led the patricians, nor the tribunes, who, though plebeians, were at the head of the well-to-do citizens. They therefore fell into disrepute, and their degradation was such, that thirty lictors used to assemble and do what the Comitia Curiata should have done.
The division by centuries was so favourable to the aristocracy that it is hard to see at first how the senate ever failed to carry the day in the comitia bearing their name, by which the consuls, the censors and the other curule magistrates were elected. Indeed, of the hundred and ninety-three centuries into which the six classes of the whole Roman people were divided, the first class contained ninety-eight; and, as voting went solely by centuries, this class alone had a majority over all the rest. When all these centuries were in agreement, the rest of the votes were not even taken; the decision of the smallest number passed for that of the multitude, and it may be said that, in the Comitia Centuriata , decisions were regulated far more by depth of purses than by the number of votes.
But this extreme authority was modified in two ways. First, the tribunes as a rule, and always a great number of plebeians, belonged to the class of the rich, and so counterbalanced the influence of the patricians in the first class.
The second way was this. Instead of causing the centuries to vote throughout in order, which would have meant beginning always with the first, the Romans always chose one by lot which proceeded alone to the election; after this all the centuries were summoned another day according to their rank, and the same election was repeated, and as a rule confirmed. Thus the authority of example was taken away from rank, and given to the lot on a democratic principle.