Peace of Passau
Luther died in 1546. In 1547, the Schmalkaldic War started out as a battle between two Lutheran rulers, but soon, Holy Roman Imperial forces joined the battle and conquered the members of the Schmalkaldic League, oppressing and exiling many Lutherans as they enforced the terms of the Augsburg Interim until religious freedom was secured for Lutherans through the Peace of Passau of 1552 and the Peace of Augsburg of 1555.