October 31, 2017: Today marks the five-hundredth anniversary of what has come to be considered the formal beginning of the Protestant Reformation. That’s because, on October 31, 1517, Martin Luther (1483–1546), then a Roman Catholic Augustinian monk and priest, nailed a notice on the door of All Saints’ Church in Wittenberg, Germany. He titled the notice, “Disputation on the Power and Efficacy of Indulgences,” but it became known as Luther’s 95 Theses.