Jarl Brum is a character from the novel "Six of Crows", the first book of a duology set in Leigh Bardugo's GrishaVerse. He is the commander of the Drüskelle, mentor of Matthias Helvar and father of Hanne Brum.
Birger Jarl was a Swedish statesman and the founder of Stockholm. Jarl Kulle was a Swedish actor.
― Anonymous User 12/20/2005
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Birger Jarl was a Swedish statesman, as noted above. But his real name was Birger Magnusson. Jarl was his title and should be spelled with a lower case letter: Birger jarl.