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
In Asia also this royal testament kindled a civil war. Relying on the aversion of the Asiatics to the foreign rule which awaited them, Aristonicus, a natural son of Eumenes II, made his appearance in Leucae, a small seaport between Smyrna and Phocaea, as a pretender to the crown. Phocaea and other towns joined him, but he was defeated at sea off Cyme by the Ephesians--who saw that a steady adherence to Rome was the only possible way of preserving their privileges--and was obliged to flee into the interior. The movement was believed to have died away when he suddenly reappeared at the head of the new "citizens of the city of the sun,"(33) in other words, of the slaves whom he had called to freedom en masse, mastered the Lydian towns of Thyatira and Apollonis as well as a portion of the Attalic townships, and summoned bands of Thracian free-lances to join his standard.
33. These strange "Heliopolites" may, according to the probable opinion which a friend has expressed to me, be accounted for by supposing that the liberated slaves constituted themselves citizens of a town Heliopolis--not otherwise mentioned or perhaps having an existence merely in imagination for the moment--which derived its name from the God of the Sun so highly honoured in Syria.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=93