The great political events of this period were not without their effect on Schlegel's mind, and in 1813 he came forward as a political writer, when his powerful pen was not without its effect in rousing the German mind from the torpor into which it had sunk beneath the victorious military despotism of France. But he was called upon to take a more active part in the measures of these stirring times, and in this year entered the service of the Crown Prince of Sweden, as secretary and counsellor at head quarters. For this Prince he had a great personal regard, and estimated highly both his virtues as a man and his talents as a general. The services he rendered the Swedish Prince were duly appreciated and rewarded, among other marks of distinction by a patent of nobility, in virtue of which he prefixed the "Von" to his paternal name of Schlegel. The Emperor Alexander, of whose religious elevation of character he always spoke with admiration, also honoured him with his intimacy and many tokens of esteem.
Upon the fall of Napoleon he returned to Coppet with Madame de Staël, and in 1815 published a second volume of his _Poetical Works_, (Heildelberg, 1811-1815, 2nd edit., 2 vols., 1820). These are characterized not merely by the brilliancy and purity of the language, but also by the variety and richness of the imagery. Among these the _Arion_, _Pygmalion_, and _Der Heilige Lucas_ (St. Luke,) the Sonnets, and the sublime elegy, _Rhine_, dedicated to Madame de Staël, deserve especial mention, and give him a just claim to a poet's crown.
On the death of his friend and patroness in 1819, he accepted the offer of a professor's chair in Bonn, where he married a daughter of Professor Paulus. This union, as short-lived as the first, was followed by a separation in 1820. In his new position of academic tutor, while he diligently promoted the study of the fine arts and sciences, both of the Ancient and the Moderns, he applied himself with peculiar ardour to Oriental literature, and particularly to the Sanscrit. As a fruit of these studies, he published his _Indian Library_, (2 vols., Bonn, 1820-26); he also set up a press for printing the great Sanscrit work, the _Râmâjana_ (Bonn, 1825). He also edited the Sanscrit text, with a Latin translation, of the Bhagavad-Gita, an episode of the great Indian Epos, the _Mahâbhârata_ (Bonn, 1829). About this period his Oriental studies took, him to France, and afterwards to England, where, in London and in the college libraries of Oxford and Cambridge, and the East India College at Hailesbury, he carefully examined the various collections of Oriental MSS. On his return he was appointed Superintendent of the Museum of Antiquities, and in 1827 delivered at Berlin a course of Lectures on the _Theory and History of the Fine Arts_, (Berlin, 1827). These were followed by his _Criticisms_, (Berlin, 1828), and his _Réflexion sur l'Etude des Langues Asiatiques_, addressed to Sir James Mackintosh. Being accused of a secret leaning to Roman Catholicism, (Kryptocatholicisme,) he ably defended himself in a reply entitled _Explication de quelques Malentendus_, (Berlin, 1828.)