The Saga of Volund the Smith.
The Edda poem tells of the smith Volund, who forged gold rings. King Nidad heard tales of him, and paid the smith a visit. Volund wasn't home at the time, and then king Nidad took one of the gold rings and gave it to his daughter Botvild. When Volund returned home he went straight to bed. King Nidad returned and had the smith chained and brought to the King's court. The King's wife advised her husband to cut the smith's Achilles' tendons and put him to work in a smithy on a holm (islet), where he would forge articles of great value for them. Only the King should have access to the island.
Volund planned his revenge. He knew that King Nidad's sons lusted for gold. It was not hard for him to lure them to the holm. There he beheaded them and made silver framed drinking-vessels out of their cranium. The gold ring Botvild got from her father was broken and secretly she went to Volund to get it repaired. Volund ravaged her.
Then he took the shape of a bird and flew to the King's court. He told everything to the shocked King Nidad: "Now go to my smithy, Nidad, and find your sons corpses at the forge. The drinking-vessels, I made out of their craniums, your wife's precious stones are their eyes and your daughter's breast jewelry their teeth. And now I have made your only daughter bear my child.
Then Volund flew away. His revenge was fulfilled.
The End.