Why did Quetzalcoatl go away? What went wrong? Mexican legends provided answers to these questions. They said that the enlightened and benevolent rule of the Plumed Serpent had been brought to an end by Tezcatilpoca, a malevolent god whose name meant ‘Smoking Mirror’ and whose cult demanded human sacrifice. It seemed that a near-cosmic struggle between the forces of light and darkness had taken place in Ancient Mexico, and that the forces of darkness had triumphed …

