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
But there was no further symptom of movement in Italy; for the war, which Falerii began in 461, scarcely deserves such a name. The Samnites doubtless turned with longing eyes towards Tarentum, which alone was still in a position to grant them aid; but it held aloof. The same causes as before occasioned its inaction--internal misgovernment, and the passing over of the Lucanians once more to the Roman party in the year 456; to which fell to be added a not unfounded dread of Agathocles of Syracuse, who just at that time had reached the height of his power and began to turn his views towards Italy.
About 455 the latter established himself in Corcyra whence Cleonymus had been expelled by Demetrius Poliorcetes, and now threatened the Tarentines from the Adriatic as well as from the Ionian sea. The cession of the island to king Pyrrhus of Epirus in 459 certainly removed to a great extent the apprehensions which they had cherished; but the affairs of Corcyra continued to occupy the Tarentines--in the year 464, for instance, they helped to protect Pyrrhus in possession of the island against Demetrius--and in like manner Agathocles did not cease to give the Tarentines uneasiness by his Italian policy.
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Reference address : https://www.ellopos.net/elpenor/rome/2-06-italians-rome.asp?pg=37