Schmalkaldic League
Lutheranism would become known as a separate movement after the 1530 Diet of Augsburg, which was convened by Charles V to try to stop the growing Protestant movement. At the Diet, Philipp Melanchthon presented a written summary of Lutheran beliefs called the Augsburg Confession. Several of the German princes (and later, kings and princes of other countries) signed the document to define "Lutheran" territories. These princes allied to create the Schmalkaldic League in 1531, which led to the Schmalkald War in 1547 that pitted the Lutheran princes of the Schmalkaldic League against the Catholic forces of Charles V.