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Barbarism is a legal civic in Civilization IV.
Strategy
Barbarism is the default legal civic of the game.
Civilopedia Entry
Barbarism is the most primitive legal system. Under barbarism, the strong take what they want from the weak: their money, possessions, even spouses and children. Disputes are settled by combat; might is right.
There is little positive to say about barbarism, except perhaps that it cuts way back on red tape. It does not support a legal class that can complicate and obfuscate the law to ensure job security.