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The jus civile was the body of Roman law that applied exclusively to Roman citizens. It was based on custom or legislation and was characterized by cumbersome formalism. As Rome's commercial interests grew, a need arose for a legal system that could also apply to foreigners.1

This led to the development of jus gentium, or the "law of nations," which was administered by magistrates and governors to handle cases involving non-citizens. Jus gentium was more flexible and drew from existing mercantile law, adapted Roman legal principles, and incorporated a magistrate's sense of fairness. By the 3rd century CE, when citizenship was extended throughout the empire, the distinction between jus civile and jus gentium largely disappeared.1

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