Parsifal (WWV 111) is a music drama in three acts by the German composer Richard Wagner and his last composition. Wagner's own libretto for the work is freely based on the 13th-century Middle High German chivalric romance Parzival of the Minnesänger Wolfram von Eschenbach and the Old French chivalric romance Perceval ou le Conte du Graal by the 12th-century trouvère Chrétien de Troyes, recounting different accounts of the story of the Arthurian knight Parzival (Percival) and his spiritual quest for the Holy Grail.
https://en.wikipedia.org/wiki/Parsifal