For 10 points, name this German composer of a cycle of operas concerning Siegfried entitled The Ring of the Nibelung.
This composer wrote the "Liebestod" theme for an opera concerning the wife of King Mark. This composer depicted Hans Sachs in another opera. This composer also wrote about Daland, who is the father of the Norwegian girl Senta, in one opera. In addition to Tristan and Isolde, The Mastersingers of Nuremburg, and The Flying Dutchman, he implemented his idea of the leitmotif in an opera where the dwarf Alberich is the antagonist to the character who kills Fafner and loves Brunhild, who is one of the titular characters of The Valkyries. For 10 points, name this German composer of a cycle of operas concerning Siegfried entitled The Ring of the Nibelung.
This composer wrote the "Liebestod" theme for an opera concerning the wife of King Mark.
Wilhelm Richard {Wagner}