Julie "Giulietta" Guicciardi (German: [ˈjuːli̯ə ɡu̯ɪˈtʃaʁdiː], Italian: [dʒuˈljetta ɡwitˈtʃardi]; 23 November 1784 – 22 March 1856) was an Austrian countess and briefly a piano student of Ludwig van Beethoven. He dedicated to her his Piano Sonata No. 14, later known as the Moonlight Sonata.