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
Many, of course, among the peace party in Carthage saw further; but, whatever they might think, they could hardly be much inclined to enlighten their Roman friends as to the impending storm, which the Carthaginian authorities had long been unable to prevent, for that step would accelerate, instead of averting, the crisis; and even if they did so, such denunciations proceeding from partisans would justly be received with great caution at Rome.
By degrees, certainly, the inconceivably rapid and mighty extension of the Carthaginian power in Spain could not but excite the observation and awaken the apprehensions of the Romans. In fact, in the course of the later years before the outbreak of war, they did attempt to set bounds to it. About the year 528, mindful of their new-born Hellenism, they concluded an alliance with the two Greek or semi-Greek towns on the east coast of Spain, Zacynthus or Saguntum (Murviedro, not far from Valencia), and Emporiae (Ampurias); and when they acquainted the Carthaginian general Hasdrubal that they had done so, they at the same time warned him not to push his conquests over the Ebro, with which he promised compliance.
This was not done by any means to prevent an invasion of Italy by the land-route--no treaty could fetter the general who undertook such an enterprise--but partly to set a limit to the material power of the Spanish Carthaginians which began to be dangerous, partly to secure the free communities between the Ebro and the Pyrenees whom Rome thus took under her protection, a basis of operations in case of its being necessary to land and make war in Spain.
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Reference address : https://www.ellopos.net/elpenor/rome/3-04-hamilcar-hannibal.asp?pg=18