Out of love for the truth and the desire to bring it to light… On October 31, 1517 Catholic priest Martin Luther posted his Disputation…on the Power and Efficacy of Indulgences on the door of All Saints’ Church in Wittenberg. This act inflamed a debate that ultimately began what we now call the Protestant Reformation. A standard, annual observance recognizing that day began in 1717. Historically it has been observed on various dates; today many churches choose to commemorate the occasion on the last Sunday in the month of October. That Sunday is referred to as Reformation Sunday.