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
Carthage with its many connections in the east could not but attract the attention of the mighty monarch, and it was probably one of his designs to convert the nominal sovereignty of the Persian king over the Tyrian colony into a real one: it was not for nothing that a Phoenician spy was found in the retinue of Alexander. Whether, however, these ideas were dreams or actual projects, the king died without having interfered in the affairs of the west, and his ideas were buried with him. For but a few brief years a Greek ruler had held in his hand the whole intellectual vigour of the Greek race combined with the whole material resources of the east.
On his death the work to which his life had been devoted--the establishment of Hellenism in the east--was by no means undone; but his empire had barely been united when it was again dismembered, and, amidst the constant quarrels of the different states that were formed out of its ruins, the object of world-wide interest which they were destined to promote--the diffusion of Greek culture in the east--though not abandoned, was prosecuted on a feeble and stunted scale.
Under such circumstances, neither the Greek nor the Asiatico-Egyptian states could think of acquiring a footing in the west or of turning their efforts against the Romans or the Carthaginians. The eastern and western state-systems subsisted side by side for a time without crossing, politically, each other's path; and Rome in particular remained substantially aloof from the complications in the days of Alexander's successors.
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Reference address : https://www.ellopos.net/elpenor/rome/2-07-pyrrhus-rome-italy.asp?pg=2