The legal process that concerns relations nations is called international law. Belief experience in some form of international dates from at least the days the Roman Empire. Such law differs from national legal systems. No court the authority or power to give backed by coercive sanctions. Even in most modern developments, international law is wholly based on custom. The precedents which it rests are the acts independent governments in their relations with another, including treaties and conventions. Behind of its rules is only a sanction: the public opinion of the world. When treaties or conventions are , however, machinery to enforce them exists-either arbitration or conciliation procedure or the of the dispute to a regional international court.