Idi, the frost giant, is the brother of Thjazzi and Gangr, and the son of Olvadi who was extremely rich in gold.
When Olvadi died, he left such a vast amount of gold that no scale could measure it. To divide their inheritance, Idi and his brothers each take as much gold as their giant mouths will hold. While Idi and Gangr are satisfied by their store of gold, their brother Thjazzi wants more. But his dastardly efforts are thwarted by the gods, and Thjazzi is defeated.
Scholars believe that the Norse metaphor "Idi’s shining talk" comes from the story of Idi’s golden inheritance.