Question: Which of the four operas in the Wagner works, based loosely on characters from the Norse sagas and the "Nibelungenlied," is discography of "Götterdämmerung"?
Context: Gofraid, King of Lochlann was a key figure in the emergence of Norse influence in Scotland and the likely progenitor of the early Kings of the Isles and of the Uí Ímair that dominated the Irish Sea and environs in the early Medieval period.  Very little is known of him, including his origins and the nature of his kingdom, although his descendants are well attested in the Irish annals.  Speculative connections between these historical figures and characters from the Norse sagas have also been made. Dark Kingdom: The Dragon King (also known as "Ring of the Nibelungs", "Die Nibelungen"," Curse of the Ring" and "Sword of Xanten") is a 2004 German television film directed by Uli Edel and starring Benno Fürmann, Alicia Witt, Kristanna Loken and Max von Sydow.  The film is based on the Norse mythology story "Völsungasaga" and the German epic poem "Nibelungenlied", which tells the mythological story of Siegfried the Dragon-Slayer.  Richard Wagner's music dramas "Siegfried" and "Götterdämmerung" are based on the same material.  "Dark Kingdom: The Dragon King" was written by the husband and wife team of Diane Duane and Peter Morwood and is a Tandem Communications production.  It was filmed entirely in South Africa. The Rhinemaidens are the three water-nymphs ("Rheintöchter" or "Rhine daughters") who appear in Richard Wagner's opera cycle "Der Ring des Nibelungen".  Their individual names are Woglinde, Wellgunde and Flosshilde (Floßhilde), although they are generally treated as a single entity and they act together accordingly.  Of the 34 characters in the "Ring" cycle, they are the only ones who did not originate in the Old Norse "Eddas".  Wagner created his Rhinemaidens from other legends and myths, most notably the "Nibelungenlied" which contains stories involving water-sprites (nixies) or mermaids.  The key concepts associated with the Rhinemaidens in the "Ring" operas—their flawed guardianship of the Rhine gold, and the condition (the renunciation of love) through which the gold could be stolen from them and then transformed into a means of obtaining world power—are wholly Wagner's own invention, and are the elements that initiate and propel the entire drama. Sigrid the Haughty, also known as Sigríð Storråda, is a queen appearing in Norse sagas as wife, first of Eric the Victorious of Sweden, then Sweyn Forkbeard of Denmark.  Sigrid appears in many sagas composed generations after the events they describe, but there is no reliable evidence as to her existence as they describe her.  The figure of Sigrid appears mainly in late Icelandic sagas, while more contemporary sources such as Thietmar of Merseburg and Adam of Bremen instead claim that Sweyn was married to a Polish princess, identified as Świętosława.  Snorri Sturlason gives conflicting information and in one place says that Sweyn was married to Sigrid and in another that he was married to a Gunhild of Wenden. Saints' sagas (Old Norse "heilagra manna sögur") are a genre of Old Norse sagas comprising the prose hagiography of medieval western Scandinavia. This is a discography of "Götterdämmerung", the fourth of the four operas that make up "Der Ring des Nibelungen" ("The Ring of the Nibelung"), by Richard Wagner, which received its premiere at the Bayreuth Festspielhaus on 17 August 1876. Der Ring des Nibelungen (The Ring of the Nibelung), WWV 86, is a cycle of four German-language epic music dramas composed by Richard Wagner.  The works are based loosely on characters from the Norse sagas and the "Nibelungenlied".  The composer termed the cycle a "Bühnenfestspiel" (stage festival play), structured in three days preceded by a " " ("preliminary evening").  It is often referred to as the Ring Cycle, "Wagner's Ring", or simply "The Ring". Oistin mac Amlaíb (Old Norse: "Eysteinn Óláfsson" ) was a ninth-century Norse or Norse-Gael leader who is sometimes identified as a King of Dublin.  He was a son of Amlaíb Conung and nephew of Ímar, founder of the Uí Ímair dynasty.  He is sometimes identified with Thorstein the Red, a figure who features in the Norse sagas. Gudrød the Hunter (Old Norse: "Guðrǫðr veiðikonungr", Norwegian: "Gudrød Veidekonge", litterary "Gudrod Hunterking"), also known as the Magnificent (Old Norse: "enn gǫfugláti", Norwegian: "den gjeve"), is a legendary character portrayed in the Norse sagas as a Norwegian petty king in the early 9th century.  According to the sagas, he was the father of Halfdan the Black, and thus the grandfather of Harald Fairhair, the first king of unified Norway.  He is considered by modern historians to be of a more mythical nature than other ancestors of Harald and Halfdan, and he can not be identified historically.  Historians have in turn made a number of proposals seeking to identify him with various would-be contemporary historical figures. Styrbjörn the Strong (Old Norse "Styrbjörn Sterki") (died c. 985) was, according to late Norse sagas, the son of the Swedish king Olof, and the nephew of Olof's co-ruler and successor Eric the Victorious, who defeated and killed Styrbjörn at the Battle of Fyrisvellir.  As with many figures in the sagas, doubts have been cast on his existence, but he is mentioned in a roughly contemporary skaldic poem about the battle.  According to legend, his original name was "Björn" and "Styr-", added when he had grown up, was an epithet meaning that he was restless, controversially forceful and violent.
Answer: the fourth