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.
After handing over the care of the various sacrificial rites to the Flamens and other priests, and calling up a fresh army, Ancus advanced against Politorium, a city belonging to the Latins. He took it by assault, and following the custom of the earlier kings who had enlarged the State by receiving its enemies into Roman citizenship, he transferred the whole of the population to Rome.
The Palatine had been settled by the earliest Romans, the Sabines had occupied the Capitoline hill with the Citadel, on one side of the Palatine, and the Albans the Caelian hill, on the other, so the Aventine was assigned to the new-comers.
Not long afterwards there was a further addition to the number of citizens through the capture of Tellenae and Ficana. Politorium after its evacuation was seized by the Latins and was again recovered; and this was the reason why the Romans razed the city, to prevent its being a perpetual refuge for the enemy.