Following the Congress of Vienna (1815), he was councilor of legation in the Austrian embassy at the Frankfurt Diet, but in 1818 he returned to Vienna. In 1819 he and Clemens Brentano made a trip to Rome, in the company of Metternich and Gentz. There he met with his wife and her sons. In 1820 he started a conservative Catholic magazine, "Concordia" (1820–1823), but was criticized by Metternich and by his brother August Wilhelm, then professor of Indology in Bonn and busy publishing the Bhagavad Gita. Schlegel began the issue of his "Sämtliche Werke" (Collected Works). He also delivered lectures, which were republished in his "Philosophie des Lebens" (Philosophy of Life) (1828) and in his "Philosophie der Geschichte" (Philosophy of History) (1829). He died on 12 January 1829 at Dresden, while preparing a series of lectures.