Why the 30 Years War Started: Prague Defenestration and Habsburg Power

The Thirty Years’ War began with a clash of religion and power inside the Holy Roman Empire, and it quickly grew into one of Europe’s most destructive conflicts. After the Protestant Reformation, Catholic and Protestant states lived in uneasy peace, each fearing the other would gain too much influence.

The story starts in Bohemia with the famous Defenestration of Prague, when Protestant nobles rebelled against the Catholic Habsburg emperor and threw his officials out of a castle window. From there, the fighting spread as Spain backed the Austrian Habsburgs, while Sweden and France intervened to weaken Habsburg dominance. What began as a local uprising soon became a wider struggle for political control across the continent.

This history explainer traces how religion gave way to power politics, and how 30 brutal years of war, famine, and disease devastated Germany. The conflict ended with the Peace of Westphalia in 1648, which recognized state sovereignty and reduced the power of the Holy Roman Empire.

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