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
Rome and the Greek Naval Powers
Rome very naturally sought to find support against Carthage from the Greek maritime states. Her old and close relations of amity with Massilia continued uninterrupted. The votive offering sent by Rome to Delphi, after the conquest of Veii, was preserved there in the treasury of the Massiliots.
After the capture of Rome by the Celts there was a collection in Massilia for the sufferers by the fire, in which the city chest took the lead; in return the Roman senate granted commercial advantages to the Massiliot merchants, and, at the celebration of the games in the Forum assigned a position of honour (-Graecostasis-) to the Massiliots by the side of the platform for the senators.
To the same category belong the treaties of commerce and amity concluded by the Romans about 448 with Rhodes and not long after with Apollonia, a considerable mercantile town on the Epirot coast, and especially the closer relation, so fraught with danger for Carthage, which immediately after the end of the Pyrrhic war sprang up between Rome and Syracuse.(23)
23. Cf. II. VII. Submission of Lower Italy
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Reference address : https://www.ellopos.net/elpenor/rome/2-07-pyrrhus-rome-italy.asp?pg=65