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 Historical Position of Pyrrhus
Pyrrhus, king of Epirus, was himself simply a military adventurer. He was none the less a soldier of fortune that he traced back his pedigree to Aeacus and Achilles, and that, had he been more peacefully disposed, he might have lived and died as "king" of a small mountain tribe under the supremacy of Macedonia or perhaps in isolated independence.
He has been compared to Alexander of Macedonia; and certainly the idea of founding a Greek empire of the west--which would have had as its core Epirus, Magna Graecia, and Sicily, would have commanded both the Italian seas, and would have reduced Rome and Carthage to the rank of barbarian peoples bordering on the Hellenistic state-system, like the Celts and the Indians--was analogous in greatness and boldness to the idea which led the Macedonian king over the Hellespont. But it was not the mere difference of issue that formed the distinction between the expedition to the east and that to the west.
Alexander with his Macedonian army, in which the staff especially was excellent, could fully make head against the great-king; but the king of Epirus, which stood by the side of Macedonia somewhat as Hesse by the side of Prussia, could only raise an army worthy of the name by means of mercenaries and of alliances based on accidental political combinations.
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Reference address : http://www.ellopos.net/elpenor/rome/2-07-pyrrhus-rome-italy.asp?pg=4