The law of peoples was a later development that came about as the Romans rushed to provide laws for the peoples they'd conquered. Unlike civil law, which was only intended for Roman citizens, the law of peoples applied to all people, regardless of nationality. The law of peoples established the rights of personal property. The law of peoples also laid down the laws of trade, commerce, and contracts.
Natural law. A great Roman statesman named Cicero believed that this natural law superseded the laws of men and states. Roman natural law held that all men were born equal and that they have certain rights that no government can violate. Nearly 2,000 years later, this Roman concept of natural law would inspire the founding fathers of America.