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.
The Porcian law, however, seems to have been passed solely for the protection of the citizens in life and limb, for it imposed the severest penalties on any one who killed or scourged a Roman citizen.