camarilla

Dictionary.com/Word of the Day:

camarilla \kam-uh-RIL-uh; -REE-yuh\, noun:
A group of secret and often scheming advisers, as of a king; a cabal or clique.

Camarilla comes from Spanish, literally, "a small room," from Late Latin camera, "chamber" ("vault; arched roof" in Latin), from Greek kamara, "vault."