Tagged: Cuius regio eius religio

1st October 2022

Explainer: The Treaty of Westphalia and its impact on the development of modern Europe

The Treaty of Westphalia was a series of peace agreements signed between the Holy Roman Empire and the Kingdom of France in 1648, ending the Thirty Years’ War in the Holy Roman Empire and...

IR Terminology

20th September 2022

Cuius Regio, Eius Religio: Definition and Impact on European History

Cuius regio, eius religio is a Latin phrase that means “whose realm, his religion.” (Pronunciation: “KWEE-us REY-jee-oh, AY-us REH-lee-jee-oh.”) It is a principle that was established by the Peace of Westphalia in 1648, which...