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
But worst of all, naturally, was the condition of Sicily, the chosen land of the plantation system. Brigandage had long been a standing evil there, especially in the interior; it began to swell into insurrection. Damophilus, a wealthy planter of Enna (Castrogiovanni), who vied with the Italian lords in the industrial investment of his living capital, was attacked and murdered by his exasperated rural slaves; whereupon the savage band flocked into the town of Enna, and there repeated the same process on a greater scale.
The slaves rose in a body against their masters, killed or enslaved them, and summoned to the head of the already considerable insurgent army a juggler from Apamea in Syria who knew how to vomit fire and utter oracles, formerly as a slave named Eunus, now as chief of the insurgents styled Antiochus king of the Syrians. And why not? A few years before another Syrian slave, who was not even a prophet, had in Antioch itself worn the royal diadem of the Seleucids.(15)
15. Cf. IV. I. Cilicia
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Reference address : https://www.ellopos.net/elpenor/rome/4-02-reform-tiberius-gracchus.asp?pg=22