In Norse mythology, Grani is a horse owned by the hero Sigurd.

It had been to the gold-adorned hero Sigurd who was sitting on Grani that she had given her vows.

Gudrun is a major figure in the early Germanic literature centered on the hero Sigurd, son of Sigmund.

Gudrun had been married to the hero Sigurd and with him she had the daughter Svanhild.

Gudrun had been the wife of the hero Sigurd, whom her brothers had killed.

The Frankish hero Sigurd is called the Hunnish king in epic poetry.

The hero Sigurd comes seeking Fafnir's treasure, and the dragon engages him first in conversation.

In chapter 41, while the hero Sigurd is riding his horse Grani, he encounters a building on a mountain.

Later, she was freed by the hero Sigurd, who gave her the Ring of the Nibelungs.

This part of the opera is primarily inspired by the story of the legendary hero Sigurd in Norse mythology.