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. The Roman Catholic response to it was "Confutatio Augustana", also at the 1530 Diet of Augsburg. In response to the "Confutatio", Philipp Melanchthon prepared the "Prima delineatio". Although this was rejected by the Emperor, Melanchthon improved it as a private document until it was signed at a meeting of the Schmalkaldic League as the 1537 "Apology of the Augsburg Confession", but the Catholic side did not respond to it until the 1545–63 Council of Trent.