This volume had its beginnings in the two-day colloquium, "Rethinking Chichén Itzá, Tula and Tollan," that was held at Dumbarton Oaks. The selected essays revisit long-standing questions regarding the nature of the relationship between Chichen Itza and Tula. Rather than approaching these questions through the notions of migrations and conquests, these essays place the cities in the context of the emerging social, political, and economic relationships that took shape during the transition from the Epiclassic period in Central Mexico, the Terminal Classic period in the Maya region, and the succeeding Early Postclassic period.