Grýla
Grýla is a mythical giantess living in the mountains of Iceland. Most of the stories told about Gryla were to frighten bad children, and her name is mentioned in Snorri Sturluson's thirteenth century Edda.
The Christmas Ogress
Grýla was not directly linked to Christmas until the 17th century. By that time she had become the mother of the Yule Lads. Terry Gunnell hypothesizes that the medieval custom of dressing as Grýla may be related to other visiting traditions such as Julebukk or the Yule Goat and that her name may mean "threat" or "threatening".
She has the ability to detect children who are misbehaving year-round. During Christmas time, she comes from the mountains to search nearby towns for her meal. She leaves her cave and hunts for the children. She devours children as her favorite snack. Her favorite dish is a stew of naughty kids for which she has an insatiable appetite. According to legend, there is never a shortage of food for Gryla.
According to folklore Grýla has been married three times. Her third husband Leppalúði is said to be living with her in their cave in the Dimmuborgir lava fields, with the big black Yule Cat and their sons. As Christmas approaches, Grýla sets off looking for naughty boys and girls. The Grýla legend has appeared in many stories, poems, songs and plays in Iceland and sometimes Grýla dies at the end of the story.