Cuius regio, eius religio
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Cuius regio, eius religio is a Latin phrase meaning, "Whose region, his religion."
It was coined by jurists in the Holy Roman Empire, which occupied a huge chunk of Central Europe, to describe the compromise between Lutherans and Catholics in the Peace of Augsburg (1555), whereby each prince in the empire could decide whether his subjects would be Lutheran or Catholic. It was obviously too much to ask that individual subjects in the Empire could choose their own religion.