The Yule Lads are mischievous Christmas spirits in Icelandic folklore. The Yule Lads are the sons of Grýla and Leppalúði. They are a group of 13 mischievous pranksters who steal from or harass the population, and all have descriptive names that convey their favorite way of harassing. They come to town one by one during the last 13 nights before Yule. They leave small gifts in shoes that children have placed on window sills, but if the child has been disobedient, they instead leave a rotten potato in the shoe.
