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In page Roman law:

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Ius civile ("citizen law", originally ius civile Quiritium) was the body of common laws that applied to Roman citizens and the Praetores Urbani, the individuals who had jurisdiction over cases involving citizens. Ius gentium ("law of peoples") was the body of common laws that applied to foreigners, and their dealings with Roman citizens. The Praetores Peregrini were the individuals who had jurisdiction over cases involving citizens and foreigners. Ius naturale ("natural law") was the concept that all persons had a kind of common sense, which the jurists developed to explain why all people seemed to obey some laws.[citation needed]