All these nations of the Peruvian Andes appear to have once formed part of the mighty prehistoric empire of the Pirhuas, and to have retained much of the civilization of their ancestors during the subsequent centuries of separate existence and isolation. This probably accounts for the ease with which the Incas established their system of religion and government throughout their new empire, after the conquests were completed. The subjugated nations spoke dialects of the same language, and inherited many of the usages and ideas of their conquerors. For the same reason they were pretty equally matched as foes, and the Incas secured the mastery only by dint of desperate fighting and great political sagacity. But finally they did establish their superiority, and founded a second great empire in Peru. The history of the rise and progress of Inca power, as recorded by native historians in their _quipus_, and retailed to us by Spanish writers, is, on the whole, coherent and intelligible. Many blunders were inevitable in conveying the information from the mouths of natives to the Spanish inquirers, who understood the language imperfectly, and whose objects often were to reach foregone conclusions. But certain broad historical facts are brought out by a comparison of the different authorities, the succession of the last ten sovereigns is determined by a nearly complete consensus of evidence, and we can now relate the general features of the rise of Inca ascendency in Peru with a certain amount of confidence. [Illustration: INCA YUPANQUI. [After a cut in Marcoy, i. 214.—ED.]]