"On September 15, 1521, Archbishop Albrecht of Mainz celebrated the annual festival of relics at his newly built cathedral, the Church of St. Moritz and Mary Magdalene in Halle, with the official announcement that indulgences would be granted to all visitors to the exhibition of relics. Anyone who prayed at a shrine and gave alms was promised an indulgence of four thousand years; anyone who confessed his sins to one of the priests hearing confessions in the cathedral during the ten days of the celebration would receive a plenary indulgence. Pope Leo X had issued a bull in 1519 granting the cathedral of Halle the same privileges granted to the Church of St. Peter in Rome: its confessors were authorized to absolve cases usually absolved only by the apostolic see in Rome; in addition, they could convert vows into financial contributions for the completion of the Halle cathedral—privileges not unusual in the established indulgence practice of the Roman curia."
Luther, M. (1999, c1970). Vol. 39: Luther's works, vol. 39 : Church and Ministry I (J. J. Pelikan, H. C. Oswald & H. T. Lehmann, Ed.). Luther's Works (39:241). Philadelphia: Fortress Press.