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
The Romans made efforts, even at an early period, to treasure up such counsels, and copies of the leaves of the soothsaying priestess of Apollo, the Cumaean Sibyl, were accordingly a highly valued gift on the part of their Greek guest-friends from Campania. For the reading and interpretation of the fortune-telling book a special college, inferior in rank only to the augurs and Pontifices, was instituted in early times, consisting of two men of lore (-duoviri sacris faciundis-), who were furnished at the expense of the state with two slaves acquainted with the Greek language.
To these custodiers of oracles the people resorted in cases of doubt, when an act of worship was needed in order to avoid some impending evil and they did not know to which of the gods or with what rites it was to be performed. But Romans in search of advice early betook themselves also to the Delphic Apollo himself. Besides the legends relating to such an intercourse already mentioned,(16) it is attested partly by the reception of the word -thesaurus- so closely connected with the Delphic oracle into all the Italian languages with which we are acquainted, and partly by the oldest Roman form of the name of Apollo, -Aperta-, the "opener," an etymologizing alteration of the Doric Apellon, the antiquity of which is betrayed by its very barbarism.
16. Cf. I. X. Greeks and Latins
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Reference address : https://www.ellopos.net/elpenor/rome/1-12-religion.asp?pg=30