1516 Martin Luther preached against the abuse of indulgences one year prior to his nailing of the 95 theses to the Castle Church door in Wittenberg.
1517 Luther posted 95 Theses on the Castle Church door in Wittenberg, calling on all and sundry to debate the question of indulgences by word of mouth or by pen. As a result Thomas Cardinal Cajetan (1469-1534) at Rome wrote "On Indulgences" against Luther. Johann Tetzel got Professor Konrad Wimpina (ca. 1460-1531) of the new University of Frankfort to write two sets of theses against Luther. Johannes Mair von Eck (1486-1543) of Ingolstadt denounced his friend Luther as a "Bohemian," equating him to Jan Hus (ca. 1369-1415).