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
Humiliation of Rhodes
Similar treatment befell the Rhodians. They had a singularly privileged position: their relation to Rome assumed the form not of symmachy properly so called, but of friendly equality; it did not prevent them from entering into alliances of any kind, and did not compel them to supply the Romans with a contingent on demand. This very circumstance was presumably the real reason why their good understanding with Rome had already for some time been impaired.
The first dissensions with Rome had arisen in consequence of the rising of the Lycians, who were handed over to Rhodes after the defeat of Antiochus, against their oppressors who had (576) cruelly reduced them to slavery as revolted subjects; the Lycians, however, asserted that they were not subjects but allies of the Rhodians, and prevailed with this plea in the Roman senate, which was invited to settle the doubtful meaning of the instrument of peace. But in this result a justifiable sympathy with the victims of grievous oppression had perhaps the chief share; at least nothing further was done on the part of the Romans, who left this as well as other Greek quarrels to take their course.
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Reference address : https://www.ellopos.net/elpenor/rome/3-10-third-macedonian-war.asp?pg=42