 He acquired the degree of Licentiate of Sacred Theology in the University of Frankfurt an der Oder in 1517, and then of Doctor of Sacred Theology in 1518, by defending in two disputations, the doctrine of indulgences against Martin Luther.The accusation that he had sold full forgiveness for sins not yet committed caused a great scandal.It was believed that all of the money that Tetzel raised was for the ongoing reconstruction of St. Peter's Basilica, although half the money went to the Archbishop of Mainz, Cardinal Albert of Brandenburg (under whose authority Tetzel was operating), to pay off the debts incurred in securing Albert's appointment to the archbishopric.