In Chapter 14, Brown and Yaeger discuss the sociopolitical organization of several key sites in the Mopan Valley from the early Middle Preclassic through the end of the Late Classic period. Through an examination of monumental architecture, public art, and ritual practices, the authors describe the political development over this 1,600-year period beginning with Early Xunantunich, the first major political center beginning in the early Middle Preclassic, to the latest, Classic Xunantunich, which was abandoned in the 9th century. The centers of Actuncan and Buenavista del Cayo filled a vacuum in the valley in the intervening centuries, playing major roles on the political landscape during the Late Preclassic and Early Classic periods, respectively. The authors trace how political authority and ideology became more centralized and the institutions of divine kingship developed as each center succeeded one another. It is clear from the data presented in this chapter that monumental constructions are at the forefront of our understanding of the development of the political landscape in the Mopan Valley, a landscape where ritual and religion played key roles in the rise of complexity.