Schmalkaldic War
Following the Diet of Augsburg in 1530 was the Nuremberg Religious Peace which gave the Reformation more time to spread. At the end of this was the Schmalkaldic War and the ensuing Augsburg Interim in 1548 which was the imperial decree given by Charles V after his army won against the Schmalkaldic League during the Schmalkaldic War of 1547/48. The tensions between Charles V and the German Lutheran princes were finally resolved with the Peace of Augsburg in 1555, which formally acknowledged Protestantism as a legitimate religion of the Empire.