he reviewed the whole army drawn up in centuries, and purified it by
the rite called Suovetaurilia,[43] and that was called the closing
of the lustrum, because it was the conclusion of the census. Eighty
thousand citizens are said to have been rated in that survey. Fabius
Pictor, the most ancient of our historians, adds that that was the
number of those who were capable of bearing arms. To accommodate that
vast population the city also seemed to require enlargement. He took
in two hills, the Quirinal and Viminal; then next he enlarged the
Esquiline, and took up his own residence there, in order that dignity
might be conferred upon the place. He surrounded the city with a
rampart, a moat, and a wall:[44] thus he enlarged the pomerium. Those
who regard only the etymology of the word, will have the pomerium to
be a space of ground behind the walls: whereas it is rather a space
on each side of the wall, which the Etruscans, in building cities,
formerly consecrated by augury, within certain limits, both within and
without, in the direction they intended to raise the wall: so that
the houses might not be erected close to the walls on the inside, as
people commonly unite them now, and also that there might be some
space without left free from human occupation. This space, which was
forbidden to be tilled or inhabited, the Romans called pomerium, not
so much from its being behind the wall, as from the wall being behind
it: and in enlarging the boundaries of the city, these onsecrated
limits were always extended, as far as the walls were intended to be
advanced.

When the population had been increased in consequence of the
enlargement of the city, and everything had been organized at home to
meet the exigencies both of peace and war, that the acquisition of
power might not always depend on mere force of arms, he endeavoured to
extend his empire by policy and at the same time to add some ornament