Law of the land
The phrase law of the land (Latin lex terrae) is a legal term. It means all of the laws in force within a country or region. The term was first used in the Magna Carta. It was used to mean the laws of the kingdom. This was distinct from Roman law or civil law. In the United States, the Constitution declares it is the "supreme law of the land." It is the same as due process of law as justified by the Constitution.