The German composer Carl Maria von Weber (1786–1826) is best known for his operas, of which he wrote 10 between 1798 and 1826. His first four exist in various states: Die Macht der Liebe und des Weins is completely lost; two fragments survive for Das Waldmädchen (1800); the libretto to Peter Schmoll und seine Nachbarn (1803) is lost; and only three numbers from Rübezahl survive. Weber's mature operas—Silvana (1810), Abu Hassan (1811), Der Freischütz (1821), Die drei Pintos, Euryanthe (1823), Oberon (1826)—all survive intact; they were all performed within his lifetime, except Die drei Pintos which was posthumously completed by Gustav Mahler. His contributions to the genre were crucial in the development of German Romantische Oper and its national identity, exhibiting much influence on Richard Wagner. Der Freischütz, his most famous and significant work, remains among the most revered German operas.