Even Albrecht was shamed by Luther's attack, but he could not afford to relinquish his profits already pledged for the repayment of his debts; and Tetzel was encouraged to defend himself and indulgences.
For this work he procured the services of John Tetzel, and so indirectly exercised a potent influence on the course of the Reformation.
The occasion was an Indulgence proclaimed by Pope Leo X., farmed by the archbishop of Mainz, and preached by John Tetzel, a Dominican monk and a famed seller of Indulgences.
Many of the German princes had no great love for Indulgence sellers, and Frederick of Saxony had prohibited Tetzel from entering his territories.
Tetzel, in conjunction with a friend, Conrad Wimpina, had published a set of counter-theses.