Earliest among the Nahua nations to stand forth upon the mythic record are the Toltecs, whose first supremacy in Anáhuac is placed in the sixth century. Endowed by tradition with a culture surpassing that of their successors, the halo surrounding their name has been kept bright by monuments, such as the pyramids of Teotihuacan and Cholula. For five centuries this people flourish, sustained by a confederation of kings whose capitals become in turn famous as seats of learning and of imperial splendor. Religious strife, developing gradually into civil war, with attendant famine and pestilence, opens the door to ruder tribes, and the Toltecs pass off the stage. Throwing off the Toltec veil so long shielding them, a number of tribes now rise into distinct political existence, and the stronger, in connection with somewhat ruder yet more energetic incomers, form the new ruling combination, the Chichimec empire. Of the leading power, denominated the Chichimec, nothing is known; but the permanency of Nahua language and civilization leads to the supposition that it is of the same race as its predecessors. In later times the name is also applied to the wild border tribes of the north. For several centuries Anáhuac becomes the scene of intrigues and struggles between the different branches of the combination for the balance of power, during which a number of towns figure as dominating centres, and a number of tribes rise to prominence under the traditional term of conquerors and immigrants. Among these are the Aztecs, the representative nation of the Nahua civilization at the coming of the Spaniards.