The term 'barbarous one' can be summarized by two crossword solutions: HUN (3 letters) and OGRE (4 letters). A Hun was a member of a nomadic people who lived in Central Asia from the 4th to 6th centuries and were known for their ferocity and cruelty. An OGRE is a mythical creature found in many fairy tales, usually depicted as a large, cruel, monstrous, and hideous humanoid. Both terms refer to a person or creature that is violent, cruel, and barbaric.