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
Whatever can still be recognized of this grand political structure testifies to the great political sagacity of its nameless architects; and the singular cohesion, which that confederation composed of so many and so diversified ingredients subsequently exhibited under the severest shocks, stamped their great work with the seal of success. From the time when the threads of this net drawn as skilfully as firmly around Italy were concentrated in the hands of the Roman community, it was a great power, and took its place in the system of the Mediterranean states in the room of Tarentum, Lucania, and other intermediate and minor states erased by the last wars from the list of political powers.
Rome received, as it were, an official recognition of its new position by means of the two solemn embassies, which in 481 were sent from Alexandria to Rome and from Rome to Alexandria, and which, though primarily they regulated only commercial relations, beyond doubt prepared the way for a political alliance. As Carthage was contending with the Egyptian government regarding Cyrene and was soon to contend with that of Rome regarding Sicily, so Macedonia was contending with the former for the predominant influence in Greece, with the latter proximately for the dominion of the Adriatic coasts.
The new struggles, which were preparing on all sides, could not but influence each other, and Rome, as mistress of Italy, could not fail to be drawn into the wide arena which the victories and projects of Alexander the Great had marked out as the field of conflict for his successors.
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Reference address : https://www.ellopos.net/elpenor/rome/2-07-pyrrhus-rome-italy.asp?pg=87