Definition.com
The Barbarian is the original noble caste... their superiority lay, not in their physical strength, but primarily in their psychical - they were more complete human beings.
Definition.com
A Barbarian is a member of a vigorous, rough-mannered horde that delights in the destruction of advanced civilizations; e.g., the Goths in Rome, the Spaniards in Peru, and teenage street dudes in cities across the American republic.