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
Sicily a Dependency of Italy
In the western sea which was of far more account for Italy than the Adriatic, the most important position, the large and fertile island of Sicily copiously furnished with harbours, had been by the peace with Carthage transferred for the most part into the possession of the Romans. King Hiero of Syracuse indeed, who during the last twenty-two years of the war had adhered with unshaken steadfastness to the Roman alliance, might have had a fair claim to an extension of territory; but, if Roman policy had begun the war with the resolution of tolerating only secondary states in the island, the views of the Romans at its close decidedly tended towards the seizure of Sicily for themselves.
Hiero might be content that his territory--namely, in addition to the immediate district of Syracuse, the domains of Elorus, Neetum, Acrae, Leontini, Megara, and Tauromenium--and his independence in relation to foreign powers, were (for want of any pretext to curtail them) left to him in their former compass; he might well be content that the war between the two great powers had not ended in the complete overthrow of the one or of the other, and that there consequently still remained at least a possibility of subsistence for the intermediate power in Sicily. In the remaining and by far the larger portion of Sicily, at Panormus, Lilybaeum, Agrigentum, Messana, the Romans effected a permanent settlement.
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Reference address : https://www.ellopos.net/elpenor/rome/3-03-extension-italy.asp?pg=2