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 key to it is furnished by the well-attested account that the consul Quintus Marcius, that master of the "new-fashioned diplomacy," had in the camp at Heracleum (and therefore after the occupation of the pass of Tempe) loaded the Rhodian envoy Agepolis with civilities and made an underhand request to him to mediate a peace. Republican wrongheadedness and vanity did the rest; the Rhodians fancied that the Romans had given themselves up as lost; they were eager to play the part of mediator among four great powers at once; communications were entered into with Perseus; Rhodian envoys with Macedonian sympathies said more than they should have said; and they were caught.
The senate, which doubtless was itself for the most part unaware of those intrigues, heard the strange announcement, as may be conceived, with indignation, and was glad of the favourable opportunity to humble the haughty mercantile city. A warlike praetor went even so far as to propose to the people a declaration of war against Rhodes. In vain the Rhodian ambassadors repeatedly on their knees adjured the senate to think of the friendship of a hundred and forty years rather than of the one offence; in vain they sent the heads of the Macedonian party to the scaffold or to Rome; in vain they sent a massive wreath of gold in token of their gratitude for the non- declaration of war.
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Reference address : http://www.ellopos.net/elpenor/rome/3-10-third-macedonian-war.asp?pg=44