This book fills a glaring historiographical gap on the diocesan clergy of the Philippines, whose political maneuverings are now brought to the fore. It is the first of a series of two volumes on the archbishops and cathedral chapters of seventeenth-century Manila. In particular, this book examines the unstable authority of the archbishops and the preeminence of the ecclesiastical chapters at this time. First, it emphasizes the need for a new paradigm of conflict-ridden Catholic evangelization—ius predicandi—that explores the interactions and engagements of the Church’s legal agents, mainly priests, canons, and bishops, and brings their rivalries to the fore. Second, it draws attention to one of the most neglected topics in Philippine ecclesiastical history, namely the metropolitan cathedral chapters, which, far from being monolithic units at the service of their archbishops, were too highly fragmented to constitute a single power holder. This volume’s examination of these power dynamics make it clear that history of the colonial Catholic Church cannot be separated from political history of the Philippines.