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
League of the Greek Cities - Rhodes
Lastly, the most independent position among the intermediate states was held by the free Greek mercantile cities on the European shore of the Propontis as well as along the whole coast of Asia Minor, and on the islands of the Aegean Sea; they formed, at the same time, the brightest elements in the confused and multifarious picture which was presented by the Greek state-system.
Three of them, in particular, had after Alexander's death again enjoyed their full freedom, and by the activity of their maritime commerce had attained to respectable political power and even to considerable territorial possessions; namely, Byzantium the mistress of the Bosporus, rendered wealthy and powerful by the transit dues which she levied and by the important corn trade carried on with the Black Sea; Cyzicus on the Asiatic side of the Propontis, the daughter and heiress of Miletus, maintaining the closest relations with the court of Pergamus; and lastly and above all, Rhodes.
The Rhodians, who immediately after the death of Alexander had expelled the Macedonian garrison had, by their favourable position for commerce and navigation, secured the carrying trade of all the eastern Mediterranean; and their well-handled fleet, as well as the tried courage of the citizens in the famous siege of 450, enabled them in that age of promiscuous and ceaseless hostilities to become the prudent and energetic representatives and, when occasion required, champions of a neutral commercial policy.
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Reference address : https://www.ellopos.net/elpenor/rome/3-08-second-macedonian-war.asp?pg=15