Spanish writers received statements from the Indians that one or other of these cyclopean ruins was built by some particular Inca. Garcilasso de la Vega even names the architects of the Cuzco fortress. But it is clear from the evidence of the most careful investigators, such as Cieza de Leon, that there was no real knowledge of their origin, and that memory of the builders was either quite lost, or preserved in vague, uncertain traditions. The most ancient myth points to the region of Lake Titicaca as the scene of the creative operations of a Deity, or miracle-working Lord.[1155] This Deity is said to have created the sun, moon, and stars, or to have caused them to rise out of Lake Titicaca. He also created men of stone at Tiahuanacu, or of clay; making them pass under the earth, and appear again out of caves, tree-trunks, rocks, or fountains in the different provinces which were to be peopled by their descendants. But this seems to be a later attempt to reconcile the ancient Titicaca myth with the local worship of natural objects as ancestors or founders of their race, among the numerous subjugated tribes; as well as to account for the colossal statues of unknown origin at Tiahuanacu. There are variations of the story, but there is general concurrence in the main points: that the Deity created the heavenly bodies and the human race, and that the ancient people, or their rulers, were called _Pirua_. Tradition also seems to point to regions south of the lake as the quarter whence the first settlers came who worked out the earliest civilization.[1156] We may, in accordance with all the indications that are left to us, connect the great god _Illa Ticsi_ with the central figure of the Tiahuanacu sculpture, and the kneeling worshippers with the rulers of all the nations and tribes which had been subjugated by the _Hatun-runa_,[1157]—the great men who had Pirua for their king, and who originally came from the distant south. The Piruas governed a vast empire, erected imperishable cyclopean edifices, and developed a complicated civilization, which is dimly indicated to us by the numerous symbolical sculptures on the monolith. They also, in a long course of years, brought wild plants under cultivation, and domesticated the animals of the lofty Andean plateau. But it is remarkable that the shores of Lake Titicaca, which are almost treeless, and where corn will not ripen, should have been chosen as the centre of this most ancient civilization. Yet the ruins of Tiahuanacu conclusively establish the fact that the capital of the Piruas was on the loftiest site ever selected for the seat of a great empire.