October 31, 1517

Ninety-five Theses

Martin Luther sends his Ninety-five Theses to Archbishop Albrecht

The safest fact about 31 October is not a hammer blow. It is a courteous letter to an archbishop, with ninety-five propositions enclosed.

A letter, not a hammer

On 31 October 1517 Martin Luther wrote respectfully to Albrecht of Brandenburg, archbishop of Mainz and Magdeburg, and enclosed ninety-five propositions concerning indulgences. Albrecht was the senior authority responsible for the campaign Luther was criticizing.

Whether Luther also posted the theses on the Castle Church door — and whether on that day — is disputed. He never mentioned a door-posting, and the story was first recorded nearly three decades later. Posting academic notices was routine in any case, so the defiant hammering scene is dramatized.

What the ninety-five actually argued

The propositions invited a disputation at Wittenberg and asked absent scholars to take part by correspondence. No evidence shows the proposed formal debate ever took place.

The text challenged claims that indulgences freed people from every penalty while still recognizing a limited, declaratory role for papal remission. Thesis 38 says papal remission should not be despised.

Three printings by New Year

There was no instantaneous break with Rome and no documented public debate. The theses circulated in manuscript and, within weeks, appeared in three German printings — Leipzig, Nuremberg and Basel.

Albrecht referred them to theologians and to Rome, which turned the dispute into an ecclesiastical case.

Sources

Researched 23 Aug 2026 6 sources 2 audit passes Traditional date

How this was checked

Researched from the web into a fact sheet, rewritten from that sheet, then audited against it by a different model. How the pipeline works →

Traditional date. This date is the conventional one, not one fixed by a contemporary record.

What the sources leave uncertain

The surviving letter to Albrecht securely establishes 31 October 1517 as the date Luther sent the theses.
Whether he also posted them on the Castle Church door—and whether that happened on 31 October—is disputed. Luther never mentioned a door-posting, and the story was first recorded nearly three decades later.
Even if a notice was posted, the familiar image of Luther defiantly hammering it into the door is anachronistically dramatic; posting academic notices was routine.