The history of the Church in Mexico has seen an ongoing confrontation between the secular and the regular clergy. During various periods one or the other side would achieve ascendency, only to decline at a later date. The religious orders have chronicled the exploits of their brothers and friars, yet to this day the activities of the secular clergy have remained largely unknown. One critical period in the development and expansion of the secular clergy occurred between the promulgation of the Ordenanza del Patronazgo in 1574 and the end of the sixteenth century. In this quarter century many of the basic institutions of the diocesan establishment came into being, and in general the whole ecclesiastical hierarchy felt the changes. This essay specifically will focus on the implementation of the Ordenanza del Patronazgo and its effect on the secular clergy.