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
Eumenes besought the mediation of the Romans; the Roman envoy declared his readiness to mediate, but thought it better that Attalus, who commanded the Pergamene army, should not accompany him lest the barbarians might be put into ill humour. Singularly enough, he accomplished nothing; in fact, he told on his return that his mediation had only exasperated the barbarians. No long time elapsed before the independence of the Galatians was expressly recognized and guaranteed by the senate.
Eumenes determined to proceed to Rome in person, and to plead his cause in the senate. But the latter, as if troubled by an evil conscience, suddenly decreed that in future kings should not be allowed to come to Rome; and despatched a quaestor to meet him at Brundisium, to lay before him this decree of the senate, to ask him what he wanted, and to hint to him that they would be glad to see his speedy departure. The king was long silent; at length he said that he desired nothing farther, and re-embarked. He saw how matters stood: the epoch of half-powerful and half-free alliance was at an end; that of impotent subjection began.
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Reference address : https://www.ellopos.net/elpenor/rome/3-10-third-macedonian-war.asp?pg=41