Garderobe

Garderobe is a historic term for a room in a medieval castle. The Oxford English Dictionary gives as its first meaning a store-room for valuables, but also acknowledges "by extension, a private room, a bed-chamber; also a privy".

The word derives from the French garde de robes, meaning "robes (or clothing) protector": thus, a closet or a toilet seat that would tend to prevent clothing from getting soiled.

Its most common use now is as a term for a castle toilet.