I.

Introduction

Reformation, great 16th-century religious revolution in the Christian church, which ended the ecclesiastical supremacy of the pope in Western Christendom and resulted in the establishment of the Protestant churches. With the Renaissance that preceded and the French Revolution that followed, the Reformation completely altered the medieval way of life in Western Europe and initiated the era of modern history. Although the movement dates from the early 16th century, when Martin Luther first defied the authority of the church, the conditions that led to his revolutionary stand had existed for hundreds of years and had complex doctrinal, political, economic, and cultural elements.