Alfred M Tozzer, a very influential voice in the field of Maya during the early half of the twentieth century, proposed that the Maya at Chichen Itza were overcome by the Toltecs three times, which subverted their culture progressively. The first invasion supposedly was of Toltecs, and was led by the mythological figure Kukulcan. The second was an invasion of Toltec-ized Itza (the founding royal family of Chichen Itza) and was led by Kukulcan II. The Third invasion was of Mexican mercenaries from Tabasco. Tozzer argued that the Maya ruled between these three waves of violence and negative culture, and that this creates the dichotomy within Chichen Itza architecture.