Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Inland Commerce of the Italians
Italian commerce must, it is obvious, have been limited in the earliest epoch to the mutual dealings of the Italians themselves. Fairs (-mercatus-), which must be distinguished from the usual weekly markets (-nundinae-) were of great antiquity in Latium. Probably they were at first associated with international gatherings and festivals, and so perhaps were connected in Rome with the festival at the federal temple on the Aventine; the Latins, who came for this purpose to Rome every year on the 13th August, may have embraced at the same time the opportunity of transacting their business in Rome and of purchasing what they needed there.
A similar and perhaps still greater importance belonged in the case of Etruria to the annual general assembly at the temple of Voltumna (perhaps near Montefiascone) in the territory of Volsinii; it served at the same time as a fair and was regularly frequented by Roman traders. But the most important of all the Italian fairs was that which was held at Soracte in the grove of Feronia, a situation than which none could be found more favourable for the exchange of commodities among the three great nations.
That high isolated mountain, which appears to have been set down by nature herself in the midst of the plain of the Tiber as a goal for the traveller, lay on the boundary which separated the Etruscan and Sabine lands (to the latter of which it appears mostly to have belonged), and it was likewise easily accessible from Latium and Umbria. Roman merchants regularly made their appearance there, and the wrongs of which they complained gave rise to many a quarrel with the Sabines.
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Reference address : https://www.ellopos.net/elpenor/rome/1-13-agriculture-trade-commerce.asp?pg=20