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
Province of Asia - War against Aristonicus
With him the house of the Attalids became extinct. In such an event, according to the constitutional law which held good at least for the client-states of Rome, the last ruler might dispose of the succession by testament. Whether it was the insane rancour against his subjects which had tormented the last Attalid during life that now suggested to him the thought of bequeathing his kingdom by will to the Romans, or whether his doing so was merely a further recognition of the practical supremacy of Rome, cannot be determined. The testament was made;(32) the Romans accepted the bequest, and the question as to the land and the treasure of the Attalids threw a new apple of contention among the conflicting political parties in Rome.
32. In the same testament the king gave to his city Pergamus "freedom," that is the --demokratia--, urban self-government. According to the tenor of a remarkable document that has recently been found there (Staatsrecht, iii(3). p. 726) after the testament was opened, but before its confirmation by the Romans, the Demos thus constituted resolved to confer urban burgess-rights on the classes of the population hitherto excluded from them, especially on the -paroeci- entered in the census and on the soldiers dwelling in town and country, including the Macedonians, in order thus to bring about a good understanding among the whole population.
Evidently the burgesses, in confronting the Romans with this comprehensive reconciliation as an accomplished fact, desired, before the Roman rule was properly introduced, to prepare themselves against it and to take away from the foreign rulers the possibility of using the differences of rights within the population for breaking up its municipal freedom.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=92