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 Hither Spain the hitherto almost nominal rule of the Romans over the Celtiberian tribes was placed on a firmer basis by Quintus Fulvius Flaccus, who after a great victory over them in 573 compelled at least the adjacent cantons to submission; and especially by his successor Tiberius Gracchus (575, 576), who achieved results of a permanent character not only by his arms, by which he reduced three hundred Spanish townships, but still more by his adroitness in adapting himself to the views and habits of the simple and haughty nation.
He induced Celtiberians of note to take service in the Roman army, and so created a class of dependents; he assigned land to the roving tribes, and collected them in towns--the Spanish town Graccurris preserved the Roman's name--and so imposed a serious check on their freebooter habits; he regulated the relations of the several tribes to the Romans by just and wise treaties, and so stopped, as far as possible, the springs of future rebellion.
His name was held in grateful remembrance by the Spaniards, and comparative peace henceforth reigned in the land, although the Celtiberians still from time to time winced under the yoke.
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Reference address : https://www.ellopos.net/elpenor/rome/3-07-peace-hannibal-third-period.asp?pg=34