The concept of natural law was very important in the development of Anglo-American common law. In the struggles between Parliament and the monarchy, Parliament often made reference to the Fundamental Laws of England which embodied natural law since time immemorial and set limits on the power of the monarchy. The concept of natural law was expressed in the English Bill of Rights and the United States Declaration of Independence -- and by 19th-century anarchist and legal theorist, Lysander Spooner.
The Roman Catholic Church understands natural law to be immanent in nature, in large part due to the influence of Thomas Aquinas.
For complete theories of law based on natural law, see libertarianism and particularly anarcho-capitalism. For theories of law which reject the concept of natural law, see legal positivism.
Compare with: Natural justice
See also: human rights
There is a also political Natural Law Party.