The tetralogy "Der Ring des Nibelungen" (The Ring of the Nibelung" by Wagner is based on characters and themes from a certain mythology. Which on?

Explanation

Wilhelm Richard Wagner (1813-1883) was a German composer, best known for his operas. Wagner was born in Leipzig and died in Venice. He wrote "Der fliegende Holländer" (1843), "Tristan und Isolde" (1865), "Parsifal" (1822) and the four operas in the "Der Ring des Nibelungen" (1848-1874): "Das Rheingold", "Die Walküre", "Siegfried" and "Götterdämmerung". The tetralogy is based on characters and themes from Norse mythology.