Civil law, or civilian law, is a legal system originating in Europe, intellectualized within the framework of Roman law, the main feature of which is that its core principles are codified into a referable system which serves as the primary source of law. This can be contrasted with common law systems, the intellectual framework of which comes from judge-made decisional law, and gives precedential authority to prior court decisions, on the principle that it is unfair to treat similar facts differently on different occasions (doctrine of judicial precedent, or stare decisis).