April 16, 1521: German reformer Martin Luther arrives at the Diet of Worms, convinced he would get the hearing he requested in 1517 to discuss the abuse of indulgences and his "95 Theses." He was astounded when he discovered it would not be a debate, but rather a judicial hearing to see if he wished to recant his words. In defending himself the next day, Luther said, "Unless I can be instructed and convinced with evidence from the Holy Scriptures or with open, clear, and distinct grounds of reasoning ...