In Wandering Ronin, the barbarian is a wild, rough combat class. Preferring the allure of the life in the open wilderness, the barbarian is rarely seen in town unless he is there for needs, not wants. Most barbarians have their own code of ethics, morals, and honor, and their culture may be offensive to civilized people.

From the Rulebook:

Generally considered to be the less advanced of most societies, 

barbarians are wild-eyed and brash combatants

who rush head-long into battle, with little thought and even less fear. 

Examples: Conan, Attila the Hun, Genghis Khan, the Huns, the Visigoth