Carl Czerny
Leopold Andreas Ignaz Sonnleithner, (from 1828 Leopold Edler von Sonnleithner, born 15 November 1797 in Wien; died 3 March 1873) in Vienna, was an Austrian lawyer and a well-known personality of the Viennese Classical music scene. He was a friend and patron of Ludwig van Beethoven, Franz Schubert, Franz Grillparzer, and Carl Czerny.