Disputation on the Power and Efficacy of Indulgences (the Ninety-Five Theses)

Martin Luther's Disputation on the Power and Efficacy of Indulgences, commonly known as the Ninety-Five Theses, is a primary source of the first order, the actual document Luther is traditionally said to have posted in 1517, directly launching the theological controversy over indulgences that became the Protestant Reformation. As Luther's own words, it is unmatched authority for what he argued at that founding moment, before his positions developed further in later writings. It is a polemical academic disputation written to provoke scholarly debate within the existing Catholic university system, not a settled theological system or a neutral historical account of indulgence practice, and its specific claims about contemporary indulgence preaching reflect Luther's own contested reading of events rather than an independently verified record.