PANJANDRUM

A panjandrum is "the name of a pompous, pretentious official with considerable power, which heshe is likely to use unwisely." The full definition as given by Hook is:

PANJANDRUM

n  Samuel Foote, an eighteenth-century English writer, created some nonsense about Picninnies, Joblillies, Garyulies, "and the Grand Panjandrum himself, with the little round button on top." The other characters have almost vanished from human memory, but panjandrum survives as the name of a pompous, pretentious official with considerable power, which heshe is likely to use unwisely.

from The Grand Panjandrum: And 1,999 Other Rare, Useful, and Delightful Words and Expressions by J.N. Hook