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
Just at this time the enterprising Demetrius was once more establishing himself in a new kingdom, which on this occasion was Macedonia; of course with the intention of using it as a lever to revive the monarchy of Alexander. To keep down his ambitious designs, it was important to give him employment at home; and Ptolemy, who knew how to make admirable use of such fiery spirits as the Epirot youth in the prosecution of his subtle policy, not only met the wishes of his consort queen Berenice, but also promoted his own ends, by giving his stepdaughter the princess Antigone in marriage to the young prince, and lending his aid and powerful influence to support the return of his beloved "son" to his native land (458).
Restored to his paternal kingdom, he soon carried all before him. The brave Epirots, the Albanians of antiquity, clung with hereditary loyalty and fresh enthusiasm to the high-spirited youth--the "eagle," as they called him. In the confusion that arose regarding the succession to the Macedonian throne after the death of Cassander (457), the Epirot extended his dominions: step by step he gained the regions on the Ambracian gulf with the important town of Ambracia, the island of Corcyra,(2) and even a part of the Macedonian territory, and with forces far inferior he made head against king Demetrius to the admiration of the Macedonians themselves.
2. Cf. II. VI. Last Struggles of Samnium
Indeed, when Demetrius was by his own folly hurled from the Macedonian throne, it was voluntarily proffered by them to his chivalrous opponent, a kinsman of the Alexandrid house (467). No one was in reality worthier than Pyrrhus to wear the royal diadem of Philip and of Alexander. In an age of deep depravity, in which princely rank and baseness began to be synonymous, the personally unspotted and morally pure character of Pyrrhus shone conspicuous.
For the free farmers of the hereditary Macedonian soil, who, although diminished and impoverished, were far from sharing in that decay of morals and of valour which the government of the Diadochi produced in Greece and Asia, Pyrrhus appeared exactly formed to be the fitting king, --Pyrrhus, who, like Alexander, in his household and in the circle of his friends preserved a heart open to all human sympathies, and constantly avoided the bearing of an Oriental sultan which was so odious to the Macedonians; and who, like Alexander, was acknowledged to be the first tactician of his time.
But the singularly overstrained national feeling of the Macedonians, which preferred the most paltry Macedonian sovereign to the ablest foreigner, and the irrational insubordination of the Macedonian troops towards every non-Macedonian leader, to which Eumenes the Cardian, the greatest general of the school of Alexander, had fallen a victim, put a speedy termination to the rule of the prince of Epirus.
Do you see any typos or other mistakes? Please let us know and correct them
Reference address : https://www.ellopos.net/elpenor/rome/2-07-pyrrhus-rome-italy.asp?pg=9