Protestant Reformation — Luther's 95 Theses
On 31 October 1517, Martin Luther, an Augustinian friar and theology professor at Wittenberg, dispatched his Disputatio pro declaratione virtutis indulgentiarum ('Disputation on the Power and Efficacy of Indulgences') — the 95 Theses — to Archbishop Albert of Mainz, challenging the papal practice of selling indulgences. Within months, printed copies had spread across Germany, triggering a controversy that permanently fractured Western Christianity. Luther's challenge rested on three principles that became the watchwords of Protestantism: sola scriptura (scripture alone as authority), sola fide (faith alone as the basis of salvation), and sola gratia (grace alone as God's gift). The papacy excommunicated Luther in 1521; at the Diet of Worms the same year he refused to recant. Prince-electors who adopted his theology ('Lutheranism') used it to seize Church lands and assert independence from both the Emperor and Rome. John Calvin's more rigorous theology spread from Geneva (1541) to produce Calvinism, Reformed Protestantism, and eventually English Puritanism. The Peace of Augsburg (1555) allowed German princes to determine the religion of their territories (cuius regio, eius religio) but excluded Calvinists, setting the conditions for the Thirty Years' War. The Reformation shattered the cultural unity of Latin Christendom, produced a century and a half of religious warfare, and — through the printing press and vernacular Bible — fundamentally transformed European literacy, governance, and intellectual culture.
- Year: 1517 CE
- Category: Cultural
