An evil dwarf in Der Stricker’s Daniel.
Armed with a magic sword that defied all armor, Juran terrorized the land of the Dark Mountain. He wanted to marry the maiden of the Dark Mountain, so he killed her father. No knight could oppose him.
Daniel of the Blossoming Valley, one of Arthur’s knights, cunningly convinced Juran to show his true prowess by fighting him without the sword, and Juran was slain. Daniel used his sword to kill the two giants of Cluse.
Source
Daniel von dem blühenden Tal | Der Stricker, 1210-1225