A castellan was the governor or captain of a castellany and its castle.[1] The word stems from the Latin Castellanus,[2] derived from castellum "castle". Sometimes also known as a constable, governor of the castle district or captain, the Constable of the Tower of London is, in fact, a form of castellan. A castellan was almost always male, but could occasionally be female, as when, in 1194, Beatrice inherited her father's castellany of Bourbourg upon the death of her brother, Roger.[3]