Armin Heigl has written:

'Cuius regio, eius religio?' -- subject(s): Religious life and customs, Reformation, Church history

King Charles V issued the Peace of Augsburg "cuius regio eius religio" (whose region, whose religion); however, this only applied to Catholics and Lutherans. After the Thirty Years War, Calvinism was added(Peace of Westphalia).

In the Peace of Augsburg of 1555, Charles V agreed with the German princes that the religious beliefs of each prince would determine which religion - either Catholic or Protestant - would be dominant in his country. The wording in Latin of that agreement has gone down in history as "cuius regio, eius religio".

The Peace of Augsburg was a treaty between Charles V and the Schmalkaldic League (a group of Lutheran princes) on 25 September 1555 in Augsburg, Germany. It was the official end of the wars between protestants and Catholics and established the "Cuius regio, eius religio, which allowed each prince in the Holy Roman Empire to choose his religion which would be for the entire state that they controlled. A period of time was allowed for non-conformists to emigrate to where their preferred religion was practiced.

The Peace of Augsburg was a treaty between Charles V and the Schmalkaldic League (a group of Lutheran princes) on 25 September 1555 in Augsburg, Germany. It was the official end of the wars between protestants and Catholics and established the "Cuius regio, eius religio, which allowed each prince in the Holy Roman Empire to choose his religion which would be for the entire state that they controlled. A period of time was allowed for non-conformists to emigrate to where their preferred religion was practiced.