7. The city was enlarged by Tullus Hostilius,15 after the destruction of Alba, and the Viminal hill included within the walls; Ancus Martius added mount Aventine, and the Esquiline and Capitoline16 being enclosed in the next reign, completed the number of the seven hills on which the ancient city stood.
8. The hill called Jani'culum, on the north bank of the Tiber, was fortified as an outwork by Ancus Martius, and joined to the city by the bridge; he also dug a trench round the newly erected buildings, for their greater security, and called it the ditch of the Quirites. 9. The public works erected by the kings were of stupendous magnitude, but the private buildings were wretched, the streets narrow, and the houses mean. It was not until after the burning of the city by the Gauls that the city was laid out on a better plan; after the Punic wars wealth flowed in abundantly, and private persons began to erect magnificent mansions. From the period of the conquest of Asia until the reign of Augustus, the city daily augmented its splendour, but so much was added by that emperor, that he boasted that "he found Rome a city of brick, and left it a city of marble."
10. The circumference of the city has been variously estimated, some writers including in their computation a part of the suburbs; according to Pliny it was near twenty miles round the walls. In consequence of this great extent the city had more than thirty gates, of which the most remarkable were the Carmental, the Esquiline, the Triumphal, the Naval, and those called Tergem'ina and Cape'na.
11. The division of the city into four tribes continued until the reign of Augustus; a new arrangement was made by the emperor, who divided Rome into fourteen wards, or regions.17 The magnificent public and private buildings in a city so extensive and wealthy were very numerous, and a bare catalogue of them would fill a volume;18 our attention must be confined to those which possessed some historical importance.
12. The most celebrated and conspicuous buildings were in the eighth division of the city, which contained the Capitol and its temples, the Senate House, and the Forum. The Capitoline-hill was anciently called Saturnius, from the ancient city of Satur'nia, of which it was the citadel; it was afterwards called the Tarpeian mount, and finally received the name of Capitoline from a human head19 being found on its summit when the foundations of the temple of Jupiter were laid. It had two summits; that on the south retained the name Tarpeian;20 the northern was properly the Capitol. 13. On this part of the hill Romulus first established his asylum, in a sacred grove, dedicated to some unknown divinity; and erected a fort or citadel21 on the Tarpeian summit. The celebrated temple of Jupiter Capitoli'nus, erected on this hill, was begun by the elder Tarquin, and finished by Tarquin the Proud. It was burned down in the civil wars between Ma'rius and Syl'la, but restored by the latter, who adorned it with pillars taken from the temple of Jupiter at Olympia. It was rebuilt after similar accidents by Vespa'sian and Domitian, and on each occasion with additional splendour. The rich ornaments and gifts presented to this temple by different princes and generals amounted to a scarcely credible sum. The gold and jewels given by Augustus alone are said to have exceeded in value four thousand pounds sterling. A nail was annually driven into the wall of the temple to mark the course of time; besides this chronological record, it contained the Sibylline books, and other oracles supposed to be pregnant with the fate of the city. There were several other temples on this hill, of which the most remarkable was that of Jupiter Feretrius, erected by Romulus, where the spolia opima were deposited.
14. The Forum, or place of public assembly, was situated between the Palatine and Capitoline hills. It was surrounded with temples, basilicks,22 and public offices, and adorned with innumerable statues.23 On one side of this space were the elevated seats from which the Roman magistrates and orators addressed the people; they were called Rostra, because they were ornamented with the beaks of some galleys taken from the city of Antium. In the centre of the forum was a place called the Curtian Lake, either from a Sabine general called Curtius, said to have been smothered in the marsh which was once there; or from24 the Roman knight who plunged into a gulf that opened suddenly on the spot. The celebrated temple of Ja'nus, built entirely of bronze, stood in the Forum; it is supposed to have been erected by Numa. The gates of this temple were opened in time of war, and shut during peace. So continuous we're the wars of the Romans, that the gates were only closed three times during the space of eight centuries. In the vicinity stood the temple of Concord, where the senate frequently assembled, and the temple of Vesta, where the palla'dium was said to be deposited.
15. Above the rostra was the Senate-house, said to have been first erected by Tullus Hostilius; and near the Comitium, or place of meeting for the patrician Curiæ.25 This area was at first uncovered, but a roof was erected at the close of the second Pu'nic war.
16. The Cam'pus Mar'tius, or field of Mars, was originally the estate of Tarquin the Proud, and was, with his other property, confiscated after the expulsion of that monarch. It was a large space, where armies were mustered, general assemblies of the people held, and the young nobility trained in martial exercises. In the later ages, it was surrounded by several magnificent structures, and porticos were erected, under which the citizens might take their accustomed exercise in rainy weather. These improvements were principally made by Marcus Agrippa, in the reign of Augustus. 17. He erected in the neighbourhood, the Panthe'on, or temple of all the gods, one of the most splendid buildings in ancient Rome. It is of a circular form, and its roof is in the form of a cupola or dome; it is used at present as a Christian church. Near the Panthe'on were the baths and gardens which Agrippa, at his death, bequeathed to the Roman people.
18. The theatres and circi for the exhibition of public spectacles were very numerous. The first theatre was erected by Pompey the Great; but the Circus Maximus, where gladiatorial combats were displayed, was erected by Tarquinus Priscus; this enormous building was frequently enlarged, and in the age of Pliny could accommodate two hundred thousand spectators. A still more remarkable edifice was the amphitheatre erected by Vespasian, called, from its enormous size, the Colosse'um.
19. Public baths were early erected for the use of the people, and in the later ages were among the most remarkable displays of Roman luxury and splendour. Lofty arches, stately pillars, vaulted ceilings, seats of solid silver, costly marbles inlaid with precious stones, were exhibited in these buildings with the most lavish profusion.
20. The aqueducts for supplying the city with water, were still more worthy of admiration; they were supported by arches, many of them a hundred feet high, and carried over mountains and morasses that might have appeared insuperable. The first aqueduct was erected by Ap'pius Clo'dius, the censor, four hundred years after the foundation
of the city; but under the emperors there were not less than twenty of these useful structures, and such was the supply of water, that rivers seemed to flow through the streets and sewers. Even now, though only three of the aqueducts remain, such are their dimensions that no city in Europe has a greater abundance of wholesome water than Rome.
21. The Cloa'cæ, or common sewers, attracted the wonder of the ancients themselves; the largest was completed by Tarquin the Proud. The innermost vault of this astonishing structure forms a semicircle eighteen Roman palms wide, and as many high: this is inclosed in a second vault, and that again in a third, all formed of hewn blocks of pepenno, fixed together without cement. So extensive