Heidelberg Disputation

26 April 1518, an arts-faculty lecture hall

On 26 April 1518, during the German Augustinian Hermits' general chapter at Heidelberg, Martin Luther presided over an academic disputation setting out his developing theology.

It took place in the arts faculty's lecture hall on the east side of Augustinergasse, not in the Augustinian monastery. University officials attended, the ceremonial university sceptre was present, and the university contributed four guilders.

Vicar-general Johann von Staupitz had arranged the disputation alongside the chapter so that Luther's emerging Wittenberg theology could be heard in a formal academic setting.

Forty theses, and the twelve that never came up

Luther supplied 28 theological and 12 philosophical theses. His fellow Augustinian Leonhard Beyer formally defended them while Luther presided.

The recorded discussion concentrated on justification, human works, grace and free will. The planned attack on Aristotelian philosophy apparently was not reached for lack of time.

No scandal, and a letter five days later

The disputation caused no immediate scandal, although the university later received a court rebuke for supporting an outside disputation.

Johann Eck was not there and was not Luther's challenger at Heidelberg. The controversy that led to Leipzig developed separately, through writings involving Eck and Andreas Karlstadt.

Among those impressed was the young Martin Bucer, who spoke privately with Luther and sent Beatus Rhenanus a detailed report dated 1 May.