This complex and scholarly book takes an in-depth look at Classic Maya political organization. Connections are described between calendars, their cosmological basis, and political structures. Most interesting is the idea of the MAY Cycle, a 256-year period during which one city in a geopolitical region became prominent and conducted major rituals for the region. A council of elders and priests convened to select the next MAY seat half-way through the cycle, and an orderly transition planned. This offers fresh insights into Maya rulership roles, ritual combat and the ballgame as methods of maintaining inter-polity balance. At least while the MAY cycle was followed, fighting between cities was minimalized. The increasing hostilities and warfare in the Terminal Classic reflect failure of this traditional system as Maya culture deteriorated leading to the Classic "collapse."