Johann Wolfgang von Goethe was a German writer and statesman. His body of work includes epic and lyric poetry written in a variety of metres and styles; prose and verse dramas; memoirs; an autobiography; literary and aesthetic criticism; treatises on botany, anatomy, and colour; and four novels. In addition, numerous literary and scientific fragments, more than 10,000 letters, and nearly 3,000 drawings by him are extant. A literary celebrity by the age of 25, Goethe was ennobled by the Duke of Saxe-Weimar, Karl August in 1782 after first taking up residence there in November 1775 following the success of his first novel, The Sorrows of Young Werther. He was an early participant in the Sturm und Drang literary movement. During his first ten years in Weimar, Goethe served as a member of the Duke's privy council, sat on the war and highway commissions, oversaw the reopening of silver mines in nearby Ilmenau, and implemented a series of administrative reforms at the University of Jena. He also contributed to the planning of Weimar's botanical park and the rebuilding of its Ducal Palace, which in 1998 were together designated a UNESCO World Heritage Site.Arthur Schopenhauer cited Wilhelm Meister's Apprenticeship as one of the four greatest novels ever written, along with Tristram Shandy, La Nouvelle Heloise, and Don Quixote, and Ralph Waldo Emerson selected Goethe as one of six "representative men" in his work of the same name, along with Plato, Napoleon, and William Shakespeare. Goethe's comments and observations form the basis of several biographical works, most notably Johann Peter Eckermann's Conversations with Goethe. There are frequent references to Goethe's writings throughout the works of G. W. F. Hegel, Arthur Schopenhauer, Friedrich Nietzsche, Hermann Hesse, Thomas Mann, Sigmund Freud, and Carl Jung. Goethe's poems were set to music throughout the eighteenth and nineteenth centuries by a number of composers, including Wolfgang Amadeus Mozart, Ludwig van Beethoven, Franz Schubert, Robert Schumann, Johannes Brahms, Charles Gounod, Richard Wagner, Hugo Wolf, Felix Mendelssohn, and Gustav Mahler.