From the time at which the river Tiber became the line of demarcation between Etruria on the one side and Umbria and Latium on the other, peaceful relations probably upon the whole prevailed in that quarter, and no essential change seems to have taken place in the boundary line, at least so far as concerned the Latin frontier. Vividly as the Romans were impressed by the feeling that the Etruscan was a foreigner, while the Latin was their countryman, they yet seem to have stood in much less fear of attack or of danger from the right bank of the river than, for example, from their kinsmen in Gabii and Alba; and this was natural, for they were protected in that direction not merely by the broad stream which formed a natural boundary, but also by the circumstance, so momentous in its bearing on the mercantile and political development of Rome, that none of the more powerful Etruscan towns lay immediately on the river, as did Rome on the Latin bank. The Veientes were the nearest to the Tiber, and it was with them that Rome and Latium came most frequently into serious conflict, especially for the possession of Fidenae, which served the Veientes as a sort of -tete de pont- on the left bank just as the Janiculum served the Romans on the right, and which was sometimes in the hands of the Latins, sometimes in those of the Etruscans. The relations of Rome with the somewhat more distant Caere were on the whole far more peaceful and friendly than those which we usually find subsisting between neighbours in early times. There are doubtless vague legends, reaching back to times of distant antiquity, about conflicts between Latium and Caere; Mezentius the king of Caere, for instance, is asserted to have obtained great victories over the Latins, and to have imposed upon them a wine-tax; but evidence much more definite than that which attests a former state of feud is supplied by tradition as to an especially close connection between the two ancient centres of commercial and maritime intercourse in Latium and Etruria. Sure traces of any advance of the Etruscans beyond the Tiber, by land, are altogether wanting. It is true that Etruscans are named in the first ranks of the great barbarian host, which Aristodemus annihilated in 230 under the walls of Cumae;(7) but, even if we regard this account as deserving credit in all its details, it only shows that the Etruscans had taken part in a great plundering expedition. It is far more important to observe that south of the Tiber no Etruscan settlement can be pointed out as having owed its origin to founders who came by land; and that no indication whatever is discernible of any serious pressure by the Etruscans upon the Latin nation. The possession of the Janiculum and of both banks of the mouth of the Tiber remained, so far as we can see, undisputed in the hands of the Romans. As to the migrations of bodies of Etruscans to Rome, we find an isolated statement drawn from Tuscan