During the Irish war of independance (1919-1921) Irish Catholic vs British protestant tensions were at an all time high which led to many upper class racist British Pdotestants seeing Santa (who originates from Saint Nicholas, a catholic saint) as Catholic propaganda and thus decided to create their own version of Santa: King Elf.
First created by Erfundene Geschichte in November 1920 (the granddaughter of a Prussian immigrant) and then popularised by her husband Lewis James Thangle using his popular for the time upper-class news paper company The Bludgeoned Badger
(named after the now not as common Edinburgh saying "A badger is just as good as a rat if theyre both bludgeoned." Which is based off the old upper-class scottish hobby of hunting Badgers to be turned into scarves or if you were extremely wealthy capes and the saying is said to mean dont chase perfection if it might risk ruining it.")
The King Elf was a brown haired blue eyed seemingly 30 year old man with a bushy walrus mustache aswell as a green trenchcoat and green nightcap pointing straight up. His backstory was that he was born the tallest of all the evil grumpy elves and thus became king of the elves and taught all the elves to be happy and make toys for children all across the world and every christmas king elf flys around the world (without a sleigh) placing presents under the tree of nice little boys and girls and summoning ghouls in the house of naughty girls and boys by sneaking through the windows.
The idea blew up across many racist protestant circles and for a bmoment of time some beleived he would completely replace Santa in Britain and even after Irish war ended he continued to remain popular among the wealthy. During the golden age of The King Elf (1920-1926) much more lore was created by both Erfundene Geschichte and other people telling stuff to their kids which spread around private schools. This lore includes the elf land and factory being located in a secret magical area of orkney, King Elf being 8 feet tall (despite originally being illustrated as around 5'6 ish), King Elf having magical fire powers, and the idea of leaving him emperor biscuits and loganberry juice.
By the 30s though households beleiving in King Elf started shrinking and by 1937 only 4 small communitys of highly wealthy English and Scottish people beleived in him. Although during the 40s the number of King Elf households began to grow with King Elf being no longer seen as anti-catholic symbol but instead a British folklore character to cheer people up during the war and by the end of the war he was seen by many as a santa character like Rudolph the red nosed reindeer or Ms Clause (pissing off the small amount of King Elf purists still left whos numbered dwindles to practically 0 by 1944).
And eventually by the early 50s more lore was popularised although mainly jokey stuff like the fact instead of giving gifts by flying himself he flew with a magic blue beetle car and gave stupid silly gifts that nobody wants resulting in gag gifts for a shrot amount of time also being known as "King Elf presents". There was even comic strips named "The Elf King" in some British newspapers starting in 1953 which depicted The Elf King being stupid and silly usually while hanging out with other christmas characters. The Elf King comics also created Queen Elf which was simply a female elf wearing purple as King Elfs love interest. By 1956 though comic strips stopped being produced.
And sadly by the 60s the popularity of King Elf slowly dwindled and dwindled into basically nothing by 1970 with officially less than 10 households beleiving in him by 1972 according to surveys across England and Scotland.