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Siegfried is the third of the four operas that comprise Der Ring des Nibelungen (The Ring of the Nibelung), by Richard Wagner.
Siegfried returns from his wanderings in the forest, demanding to know his parentage, and Mime is forced to explain how he took in Siegfried's mother, Sieglinde, who died giving birth.
When Siegfried draws his sword from the corpse, his hands are burned by the dragon's blood, and he instinctively puts them to his mouth.