A privy council is a body that advises the head of state of a state, typically, but not always, in the context of a monarchic government. The word "privy" means "private" or "secret"; thus, a privy council was originally a committee of the monarch's closest advisors to give confidential advice on state affairs.
Principia Cathedra the principals of the chair, from Latin cathedra, as a seat of authority and that which a cathedral's purpose is to indicate the location of such chair.
