I want to know the answer to the following question:
What entity believes itself to have the longest standing internal mechanism of laws in Western Europe?
All the background I'm provided with is that "What began with rules ("canons") adopted by the Apostles at the Council of Jerusalem in the first century has developed into a highly complex legal system encapsulating not just norms of the New Testament, but some elements of the Hebrew (Old Testament), Roman, Visigothic, Saxon, and Celtic legal traditions.". Is that enough to answer the question?