Þjazi

His most notable misdeed was the kidnapping of the goddess Iðunn, which is related in both the Prose Edda and the skaldic poem Haustlöng.

According to Skáldskaparmál, the gods Odin, Loki and Hœnir set out one day on a journey, traveling through mountains and wilderness until they were in need of food.

Loki borrowed a magical coat from Freyja that would allow him to take the shape of a falcon, then flew to Jotunheim until he reached the hall of Þjazi.

Finding Iðunn alone while Þjazi was out to sea on a boat, Loki transformed her into a nut and carried her back, flying as fast as he could.

Þjazi's daughter Skadi then put on her war gear and went to Asgard to seek vengeance, but the gods offered her atonement and compensation until she was placated.

Iðunn is carried off by Þjazi in this artwork by Harry George Theaker , 1920.
He flapped away with her, magic apples and all (1902) by Elmer Boyd Smith .