Indulgences: In Catholic theology, indulgences were certificates sold by the Church that promised remission of punishment for sins committed. Martin Luther strongly criticized this practice as he believed it undermined true repentance.
Wittenberg: The city in Germany where Martin Luther lived and taught at Wittenberg University. It became a center for theological discussions during the Reformation.
Ninety-Five Theses: This refers to Luther's list of arguments against various practices of the Catholic Church that he posted on October 31, 1517. It served as a catalyst for debates about religious reform throughout Europe.