Context: The Catholic Church has what is claimed to be the oldest continuously functioning internal legal system in Western Europe, much later than Roman law but predating the evolution of modern European civil law traditions. 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.

Question: What entity believes itself to have the longest standing internal mechanism of laws in Western Europe?
Answer: The Catholic Church

Question: What is a legal system older than Catholic law?
Answer: Roman law

Question: What is the term for laws produced at the Council of Jerusalem?
Answer: canons

Question: When was the Council of Jerusalem held?
Answer: first century

Question: Apart from the Old and New Testaments, which other cultures influenced canon?
Answer: Roman, Visigothic, Saxon, and Celtic

Question: What does the Catholic Church claim to be the oldest of in the world?
Answer: Unanswerable

Question: What laws predate both Roman law and European civil law traditions?
Answer: Unanswerable

Question: What legal traditions were not included in early canons?
Answer: Unanswerable

Question: What counsel was held in the first century BC
Answer: Unanswerable