Karl Wilhelm Friedrich (after 1814: von) Schlegel (; German: ['f?i?d??รง '?le?gl?]; 10 March 1772 โ 12 January 1829), usually cited as Friedrich Schlegel, was a German poet, literary critic, philosopher, philologist and Indologist.
With his older brother, August Wilhelm Schlegel, he was one of the main figures of the Jena romantics.
He was a zealous promoter of the Romantic movement and inspired Samuel Taylor Coleridge, Adam Mickiewicz and Kazimierz Brodzinski.
The first to notice what became known as Grimm's law, Schlegel was a pioneer in Indo-European studies, comparative linguistics, and morphological typology.
As a young man he was an atheist, a radical, and an individualist.
In 1808, the same Schlegel converted to Catholicism.
Two years later he was a diplomat and journalist in the service of the reactionary Clemens von Metternich, surrounded by monks and pious men of society.