The “seven circles” are the Palatine; the Cermalus, a branch of the Palatine extending towards the swamp (Velabrum) which in early days stretched between it and the Capitol; the Velia, the ridge which connected the Palatine with the Esquiline and afterwards almost completely disappeared owing to the constructions erected under the empire; the three summits of the Esquiline, Oppius, Cispius, and Fagutal; and finally the Secusa or Subura, an ingenious stronghold on the low ground between the Capitol, the Esquiline, and the Palatine. It is obvious that these walls did not spring up all at once. According to credible witnesses the oldest constructions only embrace the Palatine or the primitive Rome, called at a later period “the square” (_Roma quadrata_) from the shape of the Palatine Hill which was that of an irregular square. The gates and walls of this ancient urban circle remained visible down to the time of the empire; the position of two of them, namely the Porta Romana, near S. Giorgio in Velabro, and the Porta Mugionis at the arch of Titus, are still known to us, and the wall encircling the Palatine is even described by Tacitus from his own observation, at least on the side facing the Aventine and the Cælian. Although, of course, the earliest seat of the trade of the community was not here but at the citadel, still there are sufficient indications to show that this was the centre and the original seat of the urban settlers. On the Palatine was to be found its holy symbol, the so-called “outfit vault” (_mundus_) in which they had deposited all the requisites of a household and added a handful of their beloved native earth. Here too stood the building in which the curiæ assembled, each at its own altar, for religious and other purposes (_curiæ veteres_). Here too was the sanctuary of “the wolves” (_lupercal_), the house of assembly for “the leapers” (_curia saliorum_), and the dwelling of Jupiter’s priest. It was on and round this hill that the legend of the founding of the city was principally localised, and the believer was shown the straw-covered house of Romulus, the shepherd’s hut of his foster-father Faustulus, the holy fig tree on to which the coffer containing the twins was driven, and other similar relics. The Palatine was, and remained, the most aristocratic quarter of the city and therefore subsequently gave its name to the first Servian district. The oldest offshoots may have been the settlement on the branch of the Cermalus and the Velian heights, both of which were immediately connected with the Palatine and, under the Servian division of the town, were apparently included in the Palatine quarter. The position of the suburb on the Cermalus, between the town wall and that of the citadel, as well as the designation of the principal street by the name of “the Tuscan,” seems to indicate that this settlement was not voluntary but reserved for the custody of colonists of foreign race.