Besides this, out of each tribe was taken a body of one hundred Equites or Knights, called a century, which shows that these divisions, being unnecessary in a town, were at first merely military. But an instinct for greatness seems to have led the little township of Rome to provide itself in advance with a political system suitable for the capital of the world.

Out of this original division an awkward situation soon arose. The tribes of the Albans (Ramnenses) and the Sabines (Tatienses) remained always in the same condition, while that of the foreigners (Luceres) continually grew as more and more foreigners came to live at Rome, so that it soon surpassed the others in strength. Servius remedied this dangerous fault by changing the principle of cleavage, and substituting for the racial division, which he abolished, a new one based on the quarter of the town inhabited by each tribe. Instead of three tribes he created four, each occupying and named after one of the hills of Rome. Thus, while redressing the inequality of the moment, he also provided for the future; and in order that the division might be one of persons as well as localities, he forbade the inhabitants of one quarter to migrate to another, and so prevented the mingling of the races.

He also doubled the three old centuries of Knights and added twelve more, still keeping the old names, and by this simple and prudent method, succeeded in making a distinction between the body of Knights and the people, without a murmur from the latter.

To the four urban tribes Servius added fifteen others called rural tribes, because they consisted of those who lived in the country, divided into fifteen cantons. Subsequently, fifteen more were created, and the Roman people finally found itself divided into thirty-five tribes, as it remained down to the end of the Republic.

The distinction between urban and rural tribes had one effect which is worth mention, both because it is without parallel elsewhere, and because to it Rome owed the preservation of her morality and the enlargement of her empire. We should have expected that the urban tribes would soon monopolise power and honours, and lose no time in bringing the rural tribes into disrepute; but what happened was exactly the reverse. The taste of the early Romans for country life is well known. This taste they owed to their wise founder, who made rural and military labours go along with liberty, and, so to speak, relegated to the town arts, crafts, intrigue, fortune and slavery.

Since therefore all Rome's most illustrious citizens lived in the fields and tilled the earth, men grew used to seeking there alone the mainstays of the republic. This condition, being that of the best patricians, was honoured by all men; the simple and laborious life of the villager was preferred to the slothful and idle life of the bourgeoisie of Rome; and he who, in the town, would have been but a wretched proletarian, became, as a labourer in the fields, a respected citizen. Not without reason, says Varro, did our great-souled ancestors establish in the village the nursery of the sturdy and valiant men who defended them in time of war and provided for their Sustenance in time of peace. Pliny states positively that the country tribes were honoured because of the men of whom they were composed; while cowards men wished to dishonour were transferred, as a public disgrace, to the town tribes. The Sabine Appius Claudius, when he had come to settle in Rome, was loaded with honours and enrolled in a rural tribe, which subsequently took his family name. Lastly, freedmen always entered the urban, and never the rural, tribes: nor is there a single example, throughout the Republic, of a freedman, though he had become a citizen, reaching any magistracy.

This was an excellent rule; but it was carried so far that in the end it led to a change and certainly to an abuse in the political system.

First the censors, after having for a long time claimed the right of transferring citizens arbitrarily from one tribe to another, allowed most persons to enrol themselves in whatever tribe they pleased. This permission certainly did no good, and further robbed the censorship of one of its greatest resources. Moreover, as the great and powerful all got themselves enrolled in the country tribes, while the freedmen who had become citizens remained with the populace in the town tribes, both soon ceased to have any local or territorial meaning, and all were so confused that the members of one could not be told from those of another except by the registers; so that the idea of the word tribe became personal instead of real, or rather came to be little more than a chimera.

It happened in addition that the town tribes, being more on the spot, were often the stronger in the comitia and sold the State to those who stooped to buy the votes of the rabble composing them.

As the founder had set up ten curiæ in each tribe, the whole Roman people, which was then contained within the walls, consisted of thirty curia, each with its temples, its gods, its officers, its priests and its festivals, which were called compitalia and corresponded to the paganalia, held in later times by the rural tribes.