The Peace of Augsburg was an agreement of coexistence between Lutheranism and Catholicism in Germany that was signed in 1555.
The Agreement settled that state princes would choose between Catholicism or Lutheranism as the religion of their domain but would permit the free emigration of residents who dissented.
The Peace failed and was unable to provide a permanent, peaceful resolution because it left the Calvinist to the terms of the treaty and did not define the religious status of the Episcopal states.
This led to a hostile environment for Protestants and Catholics which eventually led to the 30 Years War.