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.
And whilst his subjects were moulding their characters upon the unique example of their king, the neighbouring nations, who had hitherto believed that it was a fortified camp and not a city that was placed amongst them to vex the peace of all, were now induced to respect them so highly that they thought it sinful to injure a State so entirely devoted to the service of the gods.
There was a grove through the midst of which a perennial stream flowed, issuing from a dark cave. Here Numa frequently retired unattended as if to meet the goddess, and he consecrated the grove to the Camaenae, because it was there that their meetings with his wife Egeria took place.
He also instituted a yearly sacrifice to the goddess Fides and ordered that the Flamens should ride to her temple in a hooded chariot, and should perform the service with their hands covered as far as the fingers, to signify that Faith must be sheltered and that her seat is holy even when it is in men's right hands.
There were many other sacrifices appointed by him and places dedicated for their performance which the pontiffs call the Argei. The greatest of all his works was the preservation of peace and the security of his realm throughout the whole of his reign.