It is the tradition that King Numa organised nine guilds of handicrafts amongst the Roman people that they might sink their race animosities in an identity of interests. Similarly one of the first great works for the young community, the city wall projected by Tarquinius Priscus and built by Servius Tullius, was intended to produce a fusion of the tribes which inhabited the seven hills he thus physically linked together, and which he had already united under a common government. Another enterprise, the draining of the marshes and pools which made impassable barriers of the valleys between the hills, had the same aim and result--it was a levelling process, moral as well as physical, to minimise the separation between hill and hill, race and race. On the other hand, Servius' division of the city into four regions, and these again into six parishes or _vici_, laid the seeds of an internal disunion which lasted throughout the centuries. These four regions (1) the Suburra or Caelian, (2) the Esquiline and its spurs, (3) the Collina, comprising the Viminal and Quirinal, which were called _colles_ in distinction to the other hills, the _montes_, and (4) the Palatine, persisted until the reign of Augustus. By that time the city had grown beyond its primitive limits, a thickly populated region had sprung up on the Esquiline beyond the walls and Augustus found a new division necessary. He increased the original number of regions to fourteen, and each of these he subdivided as before into parishes, the number in each region varying from seven to twenty-eight, making 265 in all. A magistrate or curator with a set of officials under him presided over each region. Each parish had its magistrate, its officers, its chapel built upon the boundary road for the public worship of the _lares compitales_, the protecting spirits of the district. At this period the poorer quarters of the city--a network of narrow streets with high houses built of inflammable materials--had been again and again devastated by fire. At night the densest darkness descended upon the city, street lighting was unknown, shop doors were shut and barred, and it was unsafe to walk abroad; those who ventured carried lights, or were preceded by servants with staves and torches. The ubiquitous beggars haunted the byways, and brigands raided the outskirts of the town. As a remedy against these evils Augustus created a force of 7000 men who were to act both as police and firemen. The whole body he placed under the command of a prefect, who acted in conjunction with the curator of the regions in keeping order, and divided it into seven battalions or cohorts, each under a tribune, and so disposed in the city that one battalion watched over the safety of two regions. The cohorts were again subdivided into seven companies under a captain or centurion. The force was distributed over the town in seven different barracks, with outlying detached quarters or _excubitoria_.