The "Nibelungen" refers to a legendary cycle of stories from Germanic mythology, primarily centered around the epic poem "Nibelungenlied." This tale narrates the adventures of the hero Siegfried, his marriage to Kriemhild, and the tragic events that follow, including betrayal and revenge. The narrative explores themes of love, loyalty, and the consequences of greed. The "Nibelungenlied" is considered one of the most important works of medieval German literature, composed in the early 13th century. It draws on older oral traditions and incorporates various characters, such as Gunther, Hagen, and Brunhild, who play significant roles in the unfolding drama of the Nibelungen saga.