Ab urbe condita
Titus Livius (Livy)
Livy. History of Rome, Volumes 1-2. Roberts, Canon, Rev, translator. London, New York: J. M. Dent and Sons; E. P. Dutton and Co., 1912.
They were invited to accept hospitality at the different houses, and after examining the situation of the City, its walls and the large number of dwelling-houses it included, they were astonished at the rapidity with which the Roman State had grown.