Teotihuacan was one of the earliest and more populous preColumbian cities, and the Feathered Serpent was its vital monument, erected circa 200 AD. This work explores the religious meanings and political implications of the pyramid with meticulous and thorough analyses of substantially new excavation data. Challenging the traditional view of the city as a legendary, sacred, or anonymously-governed centre, the book provides significant new insights on the Teotihuacan polity and society. It provides interpretations on the pyramid's location, architecture, sculptures, iconography, mass sacrificial graves and rich symbolic offerings, and concludes that the pyramid commemorated the accession of rulers who were inscribed to govern with military force on behalf of the gods. This archaeological examination of the monument shows it to be the physical manifestation of state ideologies such as the symbolism of human sacrifice, militarism, and individual-centred divine authority, ideologies which were later diffused among other Mesoamerican urban centres.