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.[9] 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;[10] 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 head[11] being found on its summit when the foundations of the temple of Jupiter were laid.