The seeds of the swift and sweeping religious movement that reshaped European thought in the 1500s were sown in the late Middle Ages. In this book, Steven Ozment traces the growth and dissemination of dissenting intellectual trends through three centuries to their explosive burgeoning in the Reformations—both Protestant and Catholic—of the sixteenth century. He elucidates with great clarity the complex philosophical and theological issues that inspired antagonistic schools, traditions, and movements from Aquinas to Calvin. This masterly synthesis of the intellectual and religious history of the period illuminates the impact of late medieval ideas on early modern society.