Strabo Geography 3.4.5

[5] The settlement of the Grecians amongst these barbarous nations may be regarded as the result of the division of these latter into small tribes and sovereignties, having on account of their moroseness no union amongst themselves, and therefore powerless against attacks from without. This moroseness is remarkably prevalent amongst the Iberians, who are besides crafty in their manner, devoid of sincerity, insidious, and predatory in their mode of life; they are bold in little adventures, but never undertake any thing of magnitude, inasmuch as they have never formed any extended power or confederacy. If they had had but the will to assist each other, neither could the Carthaginians by making an incursion have so easily deprived them of the greater part of their country, nor before them the Tyrians, then the Kelts, now called the Keltiberians and Berones, nor after these the brigand Viriathus, and Sertorius, ¹ nor any others who desired power. On this account the Romans, having carried the war into Iberia, lost much time by reason of the number of different sovereignties, having to conquer first one, then another; in fact, it occupied nearly two centuries, or even longer, before they had subdued the whole.—I return to my description.