What Event Marked the Beginning of the Protestant Reformation

The Protestant Reformation began in 1517 when Martin Luther, a German monk and theologian, famously nailed his "95 Theses" to the door of the Castle Church in Wittenberg, Germany. These theses challenged the practices of the Catholic Church, particularly the sale of indulgences, which promised forgiveness of sins. Luther's actions ignited a religious and intellectual revolution, sparking debates about church doctrine and authority. This event marked the start of the Protestant Reformation, a movement that led to the emergence of various Protestant denominations, a schism in the Catholic Church, and significant religious and social changes across Europe.