October 31, 1517Religion & PhilosophyEurope

Martin Luther's 95 Theses

Martin Luther posted his 95 Theses, challenging Catholic Church practices and sparking the Protestant Reformation.

On October 31, 1517, Martin Luther, a German monk and theologian, reportedly nailed his Ninety-Five Theses to the door of the Castle Church in Wittenberg. The document challenged the Catholic Church's sale of indulgences and questioned papal authority. Luther's act is widely regarded as the spark that ignited the Protestant Reformation, which split Western Christianity and profoundly reshaped the religious, political, and cultural landscape of Europe.

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