A garderobe is a historic architectural feature primarily found in medieval castles, serving as a primitive indoor toilet. The term comes from the French phrase garder la robe (to protect the robe), originating from the practice of hanging expensive clothing near the toilet shaft, as the pungent ammonia fumes from the human waste effectively repelled moths, fleas, and other destructive insects.

Location and Structural Design:
Exterior Projections: Most garderobes were built as small, stone latrine blocks that projected outwards from the main exterior curtain wall of a castle.

Gravity-Fed Shafts: These projections sat directly over a vertical or angled stone chute. Waste fell directly down the shaft, exiting through an opening at the base of the castle wall.

Strategic Placement: Designers positioned them away from the main entrance gates, typically over castle moats, rivers, or steep, inaccessible rocky cliffs to ensure waste washed away or remained out of reach.

Defensive Flaws: Because the vertical chutes led directly inside the castle walls, they represented a significant security vulnerability. To prevent enemy soldiers or assassins from climbing up the shaft, builders installed heavy iron grates or narrow stone baffles at the exit.

Interior Features and Ergonomics:
The Seat: Inside the small chamber, residents sat on a simple stone or wooden bench with a circular hole cut into it. Wooden seats were preferred in colder climates for comfort.

Privacy: Garderobes were usually tiny, cramped closets built into the thickness of the castle walls. Some featured heavy wooden doors, while others were closed off by simple fabric curtains.

Ventilation: Due to the obvious odor issues, builders included a small, narrow slit window in the exterior wall. This layout allowed fresh air to circulate, though it made the chamber incredibly cold during the winter.

Hygiene Materials: Castle occupants did not have toilet paper. Instead, they utilized a variety of natural materials placed in small baskets next to the seat, including moss, hay, straw, sheep's wool, or scrap rags.

Waste Management and Maintenance:
The Moat System: In castles surrounded by water, waste dropped directly into the moat. While convenient, this system heavily polluted the standing water, creating a foul-smelling defense layer.

Cesspits: For castles built on solid rock without water access, the shafts emptied into deep, enclosed stone chambers at the basement level.

Gong Fermors: These cesspits required manual cleaning. A class of workers known as "Gong Fermors" or night-soil men were hired at high wages to dig out the human waste by hand, usually working exclusively at night, and sell it to local farmers as fertilizer.