The Protestant Reformation was a pivotal 16th-century event that fundamentally reshaped European society. Emerging during the transition from the Middle Ages to the Modern Era, this movement arose from a severe crisis of credibility within the Roman Catholic Church. This article examines the historical precursors, the central roles of figures like Martin Luther and John Calvin, and the subsequent social shifts. By utilizing a historical-qualitative approach based on the source text, this study highlights how the decline of clerical monopoly and the rise of vernacular literacy led to the formation of modern nation-states. The findings suggest that the Reformation was a catalyst for religious individualism and significant structural changes across the European continent.
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