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
Kingdom of Pergamus
In Asia Minor, after the Seleucids were driven back, the kingdom of Pergamus had become the first power. Not led astray by the traditions of the Alexandrine monarchies, but sagacious and dispassionate enough to renounce what was impossible, the Attalids kept quiet; and endeavoured not to extend their bounds nor to withdraw from the Roman hegemony, but to promote the prosperity of their empire, so far as the Romans allowed, and to foster the arts of peace. Nevertheless they did not escape the jealousy and suspicion of Rome.
In possession of the European shore of the Propontis, of the west coast of Asia Minor, and of its interior as far as the Cappadocian and Cilician frontiers, and in close connection with the Syrian kings--one of whom, Antiochus Epiphanes (d. 590), had ascendedthe throne by the aid of the Attalids--king Eumenes II had by his power, which seemed still more considerable from the more and more deep decline of Macedonia and Syria, instilled apprehension in the minds even of its founders.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=88