The Yule Lads, or Yulemen, (Icelandic: jólasveinarnir or jólasveinar) are figures from Icelandic folklore who in modern times have become the Icelandic version of Santa Claus. Their number has varied throughout the ages, but currently they are considered to be thirteen. They put rewards or punishments into shoes placed by children in window sills during the last thirteen nights before Christmas Eve. Every night, one Yuletide lad visits each child, leaving gifts or rotting potatoes, depending on the child’s behavior throughout the year.
History and Origins
The Yule Lads originate from Icelandic folklore. Early on their number and depictions varied greatly depending on location, with each individual Lad ranging from mere pranksters  to homicidal monsters who eat children.
In 1932 the poem "Jólasveinarnir" was published as a part of the popular poetry book "Jólin Koma" ("Christmas Arrives") by Icelandic poet Jóhannes úr Kötlum. The poem reintroduced Icelandic society to Icelandic Yuletide folklore and established what is now considered the 'official' thirteen Yule Lads, their personalities and connection to other folkloric characters. 
The Yule Lads were originally portrayed as being mischievous, or even criminal, pranksters who would steal from, or in other way harass the population (at the time mostly rural farmers). They all had descriptive names that conveyed their modus operandi.
The Yule Lads are traditionally said to be the sons of the mountain-dwelling trolls Grýla and Leppalúði. They would trek from the mountains to scare  Icelandic children who misbehaved before Christmas. Additionally, the Yule Lads are often depicted with the Yule Cat, a beast that, according to folklore, eats children who don't receive new clothes for Christmas.
In modern times the Yule Lads have been depicted as taking on a more benevolent role  comparable to Santa Claus and other related figures. They are occasionally depicted as wearing late medieval style Icelandic clothing (only in some books and decorations), but are otherwise generally shown wearing the costume traditionally worn by Santa Claus.
List of Yule Lads
The Yule lads are said to "come to town" during the last 13 nights before Christmas. Below are the 'official' thirteen Yule Lads in the order they arrive (and depart).
Names in English are based on Hallberg Hallmundsson's translation of the poem.
|Icelandic Name||English translation||Description||Arrival||Departure|
|Stekkjastaur||Sheep-Cote Clod||Harasses sheep, but is impaired by his stiff peg-legs.||December 12||December 25|
|Giljagaur||Gully Gawk||Hides in gullies, waiting for an opportunity to sneak into the cowshed and steal milk.||December 13||December 26|
|Stúfur||Stubby||Abnormally short. Steals pans to eat the crust left on them.||December 14||December 27|
|Þvörusleikir||Spoon-Licker||Steals Þvörur (a type of a wooden spoon with a long handle - I. þvara) to lick. Is extremely thin due to malnutrition.||December 15||December 28|
|Pottaskefill||Pot-Scraper||Steals leftovers from pots.||December 16||December 29|
|Askasleikir||Bowl-Licker||Hides under beds waiting for someone to put down their 'askur' (a type of bowl with a lid used instead of dishes), which he then steals.||December 17||December 30|
|Hurðaskellir||Door-Slammer||Likes to slam doors, especially during the night.||December 18||December 31|
|Skyrgámur||Skyr-Gobbler||A Yule Lad with an affinity for skyr.||December 19||January 1|
|Bjúgnakrækir||Sausage-Swiper||Would hide in the rafters and snatch sausages that were being smoked.||December 20||January 2|
|Gluggagægir||Window-Peeper||A voyeur who would look through windows in search of things to steal.||December 21||January 3|
|Gáttaþefur||Doorway-Sniffer||Has an abnormally large nose and an acute sense of smell which he uses to locate laufabrauð.||December 22||January 4|
|Ketkrókur||Meat-Hook||Uses a hook to steal meat.||December 23||January 5|
|Kertasníkir||Candle-Stealer||Follows children in order to steal their candles (which in those days was made of tallow and thus edible).||December 24||January 6|
- Celebrating Christmas with 13 trolls Retrieved 1 June 2013
- Bad Santas Retrieved 1 June 2013
- Eve Online Introduces the “Yule Lads” Retrieved 1 June 2013
- The Yule Lads Retrieved 1 June 2013
- Forgotten Yule Lads and Lasses Retrieved 1 June 2013
- Best places to spend Christmas Retrieved 1 June 2013
- The Yule Lads: Friends or Foes? Retrieved 1 June 2013
- Bogeymen: Five scary visitors in the night by BBC Retrieved 1 June 2013
- Top 10 places to spend your 2010 Christmas Retrieved 1 June 2013
- Yule lads: Peoria woman’s family surprises her with Icelandic folklore Retrieved 1 June 2013
- "Hallberg Hallmundson's translation of 'Jólasveinarnir' by Jóhannes úr Kötlum". Jóhannes úr Kötlum, skáld þjóðarinnar. Archived from the original on December 22, 2007. Retrieved April 2, 2008.
- The Icelandic Embassy in the United States on Christmas customs in Iceland, including the Yule Lads
- Various illustrations of the Yule Lads
- A short article about the Yule Lads
- Another short article
- A translation of the poem by Jóhannes úr Kötlum
- A comprehensive site on Christmas in Iceland with much information about Yule Lads and Grýla
- An essay on Grýla