Term
Cuius regio, eius religio
A principle established in 1555 meaning "Whose realm, his religion," where a ruler's religion determined the religion of his subjects in the Holy Roman Empire.
Filed underChurch History
Definition
Latin, "Whose realm, his religion." Established in the Peace of Augsburg in 1555, meant the religion of the ruler would determine the religion of his subjects in the Holy Roman Empire.
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Last revised August 14, 2026