Luther Posts the Ninety-Five Theses in Wittenberg
A university theology professor's protest against indulgence sales starts the Reformation
Quick facts
- Location
- Wittenberg
- Author
- Martin Luther, professor of theology
- Subject
- Sale of indulgences
- Disputed detail
- Whether the theses were literally nailed to the church door
What happened
On 31 October 1517, Martin Luther, a professor of theology at the University of Wittenberg, circulated (and by tradition posted to the door of the Castle Church) a set of Ninety-Five Theses proposing an academic debate over the sale of indulgences, payments the church offered in exchange for reduced punishment for sin. Luther's theses combined precise theological argument with polemical force, and printed copies spread across German-speaking lands within weeks thanks to the printing infrastructure Gutenberg had established in Mainz decades earlier. Whether Luther actually nailed the theses to the church door, as later tradition holds, remains debated among historians, though posting a disputation notice on that door was a standard academic practice at the time.
Why it matters
This event is conventionally treated as the start of the Protestant Reformation, a religious and political rupture that split the German lands into Catholic and Protestant territories and fed directly into a century of conflict, including the Peasants' War and eventually the Thirty Years War. The wider Reformation, including Luther's later break with Rome, his Bible translation, and the spread of Protestant territorial churches, is covered in full on this site's dedicated Reformation timeline.
How we know
The Ninety-Five Theses survive in Luther's own Latin text, preserved and translated in full by the German Historical Institute's German History in Documents and Images project, alongside contemporary accounts of their rapid printed circulation.
Sources
- German History in Documents and Images (German Historical Institute). Martin Luther, Ninety-Five Theses (October 31, 1517) · Primary source (author-declared)germanhistorydocs.org · Cited as a "primary" source (no stronger domain match). · Link is live and its text matches the event's key terms (Jul 2026)
- Christian History Institute. 1517: Luther Posts the 95 Theses · Reputable sourcechristianhistoryinstitute.org · The domain "christianhistoryinstitute.org" is on our Reputable source registry. · Link is live and its text matches the event's key terms (Jul 2026)
See something wrong? . Corrections with a source get fixed fastest.
Related timelines
- The Protestant Reformation → · The full Reformation story, Luther's break with Rome, his Bible translation, and Protestantism's spread across Europe