Thomas Beauchamp, the Elder, who died in 1369, built Caesar's Tower, a masterpiece of fourteenth century military architecture. It is an irregular quatrefoil and dominates the river with its stepped base, known as "battering". Within the base there is a vaulted prison or dungeon. This dungeon also has an "oubliette", a sub-dungeon, where an unfortunate prisoner had just enough room to lie in complete darkness. Above the courtyard level the tower has three stories surmounted by a platform with a crenellated and machicolated parapet. The armory was constructed in 1669 and was added to the main southeastern wall of the castle. It was originally built as a brewery and washhouse and subsequently became a library and eventually the armory.