cuius regio, eius religio

political and religious doctrine

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June 25, 2026

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The phrase cuius regio, eius religio translates from Latin to "whose region, his religion". This political and religious doctrine, established by the Peace of Augsburg in 1555, allowed rulers within the Holy Roman Empire to choose either Lutheranism or Catholicism as the official religion of their territory. Subjects were expected to follow their ruler's chosen faith, but those who disagreed were permitted to emigrate. This agreement aimed to end religious conflict between Lutherans and Catholics, though it did not recognize other Protestant denominations like Calvinism. The Peace of Augsburg significantly increased the authority of territorial princes by granting them control over religious matters within their domains.123

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history of Europe
The Aufklärung
…reflecting the acceptance of the cuius regio, eius religio principle; it reduced the scope for internal conflicts, which elsewhere bred doubts about authority. In translating conservative attitudes into political doctrines, the contribution of the lawyers and the nature of the law they taught were crucial. In place of the moral…
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…reflecting the acceptance of the cuius regio, eius religio principle; it reduced the scope for internal conflicts, which elsewhere bred doubts about authority. In translating conservative attitudes into political doctrines, the contribution of the lawyers and the nature of the law they taught were crucial. In place of the moral…
Read More

history of Europe
The crisis in Germany
…was the right (known as cuius regio, eius religio) of every secular ruler, from the seven electors down to the imperial knights, to dictate whether their subjects’ religion was to be Lutheran or Catholic (the only officially permitted creeds). The only exceptions to this rule were the imperial free cities,…
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…was the right (known as cuius regio, eius religio) of every secular ruler, from the seven electors down to the imperial knights, to dictate whether their subjects’ religion was to be Lutheran or Catholic (the only officially permitted creeds). The only exceptions to this rule were the imperial free cities,…
Read More