Schlegel and his brother August were two of the leading members of the Jena Romantics, a group of artists and patrons between roughly 1798 and 1804 who were the earliest influential Romantic movement in Germany. Schlegel would pass through atheism and a firm commitment to individualism in his twenties before converting to Catholicism in 1808.
His contributions to philosophy mostly consist of his promotion of and work to develop the Romantic school in Germany, especially as a critical position from which to analyze art.
By Franz Gareis – http://www.zeno.org/Literatur/I/sclefpor, Public Domain, Link
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