The war against the Spaniards, who of all the nations subdued by the Romans defended their liberty with the greatest obstinacy, began in the year 200, six years after the total expulsion of the Carthaginians from their country, 206. It was exceedingly obstinate, partly from the natural state of the country, which was thickly populated, and where every place became a fortress; partly from the courage of the inhabitants; but above all, owing to the peculiar policy of the Romans, who were wont to employ their allies to subdue other nations. This war continued, almost without interruption, from the year 200 to 133, and was for the most part carried on at the same time in Hispania Citerior, where the Celtiberi were the most formidable adversaries, and in Hispania Ulterior, where the Lusitani were equally powerful. Hostilities were at the highest pitch in 195, under Cato, who reduced Hispania Citerior to a state of tranquillity 185-179, when the Celtiberi were attacked in their native territory; and 155-150, when the Romans in both provinces were so often beaten, that nothing was more dreaded by the soldiers at home than to be sent there. The extortions and perfidy of Servius Galba placed Viriathus, in the year 146, at the head of his nation, the Lusitani: the war, however, soon extended itself to Hispania Citerior, where many nations, particularly the Numantines, took up arms against Rome, 143. Viriathus, sometimes victorious and sometimes defeated, was never more formidable than in the moment of defeat; because he knew how to take advantage of his knowledge of the country, and of the dispositions of his countrymen. After his murder, caused by the treachery of Caepio, 140, Lusitania was subdued; but the Numantine war became still more violent, and the Numantines compelled the consul Mancinus to a disadvantageous treaty, 137. When Scipio, in the year 133, put an end to this war, Spain was certainly tranquil; the northern parts, however, were still unsubdued, though the Romans penetrated as far as Galatia. 22. Towards the end of this period, the Romans obtained at a much cheaper rate the possession of one of their most important provinces; for the profligate Attalus III. king of Pergamus, bequeathing them the whole of his kingdom (on what account is uncertain, see above, p. 292.), they immediately took possession of it, and kept in spite of the resistance of the legitimate heir Aristonicus, merely ceding, as a recompense, Phrygia to Mithridates V. king of Pontus. Thus, by a stroke of the pen, the largest and finest part of Asia Minor became the property of Rome. If this extraordinary legacy was the work of Roman policy, she paid dearly enough, in the long run, for this accession to her power and riches, by the destruction of her morals, and the dreadful wars to which this legacy gave rise under Mithridates.