One of the provisions in the 1648 Treaty of Westphalia stated that:

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The 1648 Treaty of Westphalia included the provision that religious differences alone could not justify war among Christian rulers. This principle established the idea of sovereignty and non-intervention in the affairs of other states, and recognized the legitimacy of Protestantism. It did not mandate tolerance for all religions in all European states, nor did it establish representation in government as a requirement for taxation.

One of the Provisions in the 1648 Treaty of Westphalia