The central figure of Toltec mythology is Quetzalcoatl. Not an author on ancient Mexico but has something to say about the glorious days when he ruled over the land. No one denies him to have been a god, the god of the air, highest deity of the Toltecs, in whose honor was erected the pyramid of Cholula, grandest monument of their race. But many insist that he was at first a man, some deified king. There were in truth many Quetzalcoatls, for his high priest always bore his name, but he himself is a pure creation of the fancy, and all his alleged history is nothing but a myth. His emblematic name, the Bird-Serpent, and his rebus and cross at Palenque, I have already explained. Others of his titles were, Ehecatl, the air; Yolcuat, the rattlesnake; Tohil, the rumbler; Huemac, the strong hand; Nani he hecatle, lord of the four winds. The same dualism reappears in him that has been noted in his analogues elsewhere; He is both lord of the eastern light and the winds. As the former, he was born of a virgin in the land of Tula or Tlapallan, in the distant Orient, and was high priest of that happy realm. The morning star was his symbol, and the temple of Cholula was dedicated to him expressly as the author of light.[181-1] As by days we measure time, he was the alleged inventor of the calendar. Like all the dawn heroes, he too was represented as of white complexion, clothed in long white robes, and, as most of the Aztec gods, with a full and flowing beard.[181-2] When his earthly-work was done he too returned to the east, assigning as a reason that the sun, the ruler of Tlapallan, demanded his presence. But the real motive was that he had been overcome by Tezcatlipoca, otherwise called Yoalliehecatl, the wind or spirit of night, who had descended from heaven by a spider's web and presented his rival with a draught pretended to confer immortality, but, in fact, producing uncontrollable longing for home. For the wind and the light both depart when the gloaming draws near, or when the clouds spread their dark and shadowy webs along the mountains, and pour the vivifying rain upon the fields.