There were also king's garths elsewhere; the one at jelling has already been mentioned as the residence of Gorm and Thyra.
There was juice enough for a kind of jelly which I believe had the peculiarity of never "jelling" properly.
1830, American English, probably a back-formation of jelly (v.). Related: Jelled; jelling. Figurative sense is first attested 1908. Middle English had gelen "congeal," but it disappeared 15c.