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.

Then a heifer of conspicuous beauty was taken from the herd, and the first sacrifice was offered; the Potitii and Pinarii, the two principal families in those parts, were invited by Hercules to assist in the sacrifice and at the feast which followed.