The man who organized Roman law into an orderly body of rules was Emperor Justinian. This became known as Justinian's Code. This code served as the legal basis for several different elements of the Byzantine society including marriage, slavery, property, and women's rights. This code was world famous, as it lasted roughly 9 centuries and it became a foundation for several other empires/countries in developing their own legal codes.
Monarchy if you are talking about a U.S. state
