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The Peace of Augsburg was the first permanent legal basis for the coexistence of Lutheranism and Catholicism in the Holy Roman Empire. This allowed the state princes to choose either Lutheranism or Catholicism as the religion of their domain and permitted the free emigration of residents who wanted to believe in other religions. This ended the conflict between the two groups, but it still left out groups like Calvinism.
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The French Wars of Religion were conflicts in France between Protestants and Roman Catholics. Huguenots became very prevalent in the French religion, as well as countries such as Spain turning to Roman Catholicism. The wars ended with Henry's embraced Roman Catholicism, but the religious toleration of the Huguenots guaranteed.
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Bartholomew’s Day Massacre was the assassination of Huguenot Protestant leaders in Paris. This set off an orgy of killing that resulted in the massacre of tens of thousands of Huguenots all across France. This massacre marked the resumption of religious civil war in France.
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The Edict of Nantes was a proclaimed law that granted a large measure of religious liberty to the Huguenots. The edict also brought the end of the French Wars of Religion, as well as Henry IV converting from Huguenot Calvinism to Roman Catholicism. It was one of the first decrees of religious tolerance in Europe and granted the French Protestant minority a ton of rights that had never been heard of before.
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The 30 Years War was a war between the Catholics and Protestants. It was thought to be one of the longest and most brutal wars of human history. However, the war slowly evolved into wanting to govern Europe instead of what religion dominates.
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The Treaty of Westphalia was the treaty that ended the Thirty Years' War. Countries such as Spain declared themselves independent, as well some gaining territory and cash. At the end of the war, there was also the end of Roman Catholicism, while protestantism stayed.