
Iceland's thirteen Yule Lads descend from the mountains one by one in December — and their mother Grýla is a fearsome giantess who preys on children.
In Iceland, Christmas is not delivered by a single jolly figure but by thirteen brothers who arrive one by one, starting on December 12th, each leaving a small gift (or a rotting potato, for bad children) in shoes left on windowsills. They are gone by January 6th. Their names describe their particular mischief: Stekkjastaur steals milk from sheep. Giljagaur hides in gullies and steals foam from buckets. Þvörusleikir licks wooden spoons. Kertasníkir steals candle stubs.
The brothers are the sons of Grýla — a giantess described in medieval Icelandic sources as having fifteen tails, each tail with a hundred bags, each bag containing twenty children she has collected and will cook. She is genuinely terrifying in origin; the Icelandic authorities in the 18th century actually issued decrees forbidding parents from using Grýla to frighten children, because the psychological harm was considered real.
The Yule Cat — Jólakötturinn — is the family pet: an enormous black cat that prowls Iceland on Christmas Eve and devours anyone who has not received at least one new piece of clothing as a gift. The Yule Lad tradition was standardized in its current form by the poem Jólasveinavísur, written by Jóhannes úr Kötlum in 1932.
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