Garderobe: Did you mean...?

A garderobe or toilet of the tower keep at Peveril Castle, Derbyshire, England. Late 12th century CE.

The medieval toilet or latrine, then called a privy or garderobe, was a primitive affair, but in a castle, one might find a little more comfort and certainly a great deal more design effort than had been invested elsewhere. Practicality...

Alure (Wall Walk) The walkway along the higher and interior part of a wall which often gives access to the higher floors of towers within the wall. Typically protected by battlements. Apse A semicircular projecting part of a building...

A typical medieval toilet or garderobe. Tower of London. 11th century CE.