<Tr> <Th> Participants </Th> <Td> Charles V; Schmalkaldic League </Td> </Tr> <Tr> <Th> Outcome </Th> <Td> (1) Established the principle Cuius regio, eius religio . (2) Established the principle of reservatum ecclesiasticum . (3) Laid the legal groundwork for two co-existing religious confessions (Catholicism and Lutheranism) in the German - speaking states of the Holy Roman Empire . </Td> </Tr> <P> The Peace of Augsburg, also called the Augsburg Settlement, was a treaty between Charles V, Holy Roman Emperor (the predecessor of Ferdinand I) and the Schmalkaldic League, signed in September 1555 at the imperial city of Augsburg . It officially ended the religious struggle between the two groups and made the legal division of Christendom permanent within the Holy Roman Empire, allowing rulers to choose either Lutheranism or Roman Catholicism as the official confession of their state . Calvinism was not allowed until the Peace of Westphalia . </P> <P> The Peace established the principle Cuius regio, eius religio ("whose realm, his religion"), which allowed the princes of states within the Holy Roman Empire to adopt either Lutheranism or Catholicism within the domains they controlled, ultimately reaffirming their sovereignty over those domains . Subjects, citizens, or residents who did not wish to conform to the prince's choice were given a grace period in which they were free to emigrate to different regions in which their desired religion had been accepted . </P>

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