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 senate hesitated; to many it seemed a prudent course to draw back a step and to wait till their dangerous antagonist should have further entangled himself or should be no more. But the grey-haired and blind consular Appius Claudius (censor 442, consul 447, 458), who had long withdrawn from state affairs but had himself conducted at this decisive moment to the senate, breathed the unbroken energy of his own vehement nature with words of fire into the souls of the younger generation.
They gave to the message of the king the proud reply, which was first heard on this occasion and became thenceforth a maxim of the state, that Rome never negotiated so long as there were foreign troops on Italian ground; and to make good their words they dismissed the ambassador at once from the city.
The object of the mission had failed, and the dexterous diplomatist, instead of producing an effect by his oratorical art, had on the contrary been himself impressed by such manly earnestness after so severe a defeat--he declared at home that every burgess in that city had seemed to him a king; in truth, the courtier had gained a sight of a free people.
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Reference address : https://www.ellopos.net/elpenor/rome/2-07-pyrrhus-rome-italy.asp?pg=30