Tripartite division of law into natural law (ius naturae o jus naturale), the law of nations (ius gentium), and the law of the city (ius civile).
One of the earliest (and famous)discussions about the conflict between different kinds of law can be found in the Greek tragedy Antigones by Sophocles (Hegel will refer to this in his Phenomenology).
See the URL below for an interesting essay about this subject.