But it is a land of darkness that lies far beyond the domain of history.15The same mists that hang round the origin of the Incas continue to settle on their subsequent annals; and, so imperfect were the records employed by the Peruvians, and so confused and contradictory their traditions, that the historian finds no firm footing on which to stand till within a century of the Spanish conquest.16 At first, the progress of the Peruvians seems to have been slow, and almost imperceptible. By their wise and temperate policy, they gradually won over the neighboring tribes to their dominion, as these latter became more and more convinced of the benefits of a just and well-regulated government. As they grew stronger, they were enabled to rely more directly on force; but, still advancing under cover of the same beneficent pretexts employed by their predecessors, they proclaimed peace and civilization at the point of the sword. The rude nations of the country, without any principle of cohesion among themselves, fell one after another before the victorious arm of the Incas. Yet it was not till the middle of the fifteenth century that the famous Topa Inca Yupanqui, grandfather of the monarch who occupied the throne at the coming of the Spaniards, led his armies across the terrible desert of Atacama, and, penetrating to the southern region of Chili, fixed the permanent boundary of his dominions at the river Maule. His son, Huayna Capac, possessed of ambition and military talent fully equal to his father's, marched along the Cordillera towards the north, and, pushing his conquests across the equator, added the powerful kingdom of Quito to the empire of Peru.17The ancient city of Cuzco, meanwhile, had been gradually advancing in wealth and population, till it had become the worthy metropolis of a great and flourishing monarchy. It stood in a beautiful valley on an elevated region of the plateau, which, among the Alps, would have been buried in eternal snows, but which within the tropics enjoyed a genial and salubrious temperature. Towards the north it was defended by a lofty eminence, a spur of the great Cordillera; and the city was traversed by a river, or rather a small stream, over which bridges of timber, covered with heavy slabs of stone, furnished an easy means of communication with the opposite banks. The streets were long and narrow; the houses low, and those of the poorer sort built of clay and reeds. But Cuzco was the royal residence, and was adorned with the ample dwellings of the great nobility;and the massy fragments still incorporated in many of the modern edifices bear testimony to the size and solidity of the ancient.18The health of the city was promoted by spacious openings and squares, in which a numerous population from the capital and the distant country assembled to celebrate the high festivals of their religion. For Cuzco was the "Holy City"; 19 and the great temple of the Sun, to which pilgrims resorted from the furthest borders of the empire, was the most magnificent structure in the New World, and unsurpassed, probably, in the costliness of its decorations by any building in the Old.