 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.In turn several Lutheran states led by Elector John Frederick I of Saxony and Landgrave Philip I of Hesse met at the town of Schmalkalden, where they established the Schmalkaldic League in 1531.At first, the Nuremberg Religious Peace of 1532 granted religious liberty to members of the Schmalkaldic League.