It is popularly thought that in 1517 he nailed his 95 theses, or protests, to a church door in Wittenberg, urging church reform.
Nagu üldiselt arvatakse, olevat ta 1517. aastal naelutanud Wittenbergi kiriku uksele 95 teesi ehk protesti, nõudes nii kiriku reformeerimist.