Related to this: I've tried to figure out what the oldest surviving organization in the world is (specifically something with some form of rules or decision-mak

Related to this: I've tried to figure out what the oldest surviving organization in the world is (specifically something with some form of rules or decision-making process that has been formally kept and amended over time instead of being replaced by a new code of rules). Best I could do is the Roman Catholic Church, but I feel like my search terms might be missing something.