Caesar's and Guy's Towers are residential and may have been inspired by French models (for example Bricquebec). Both towers are machicolated and Caesar's Tower features a unique double parapet. The two towers are also vaulted in stone on every storey. Caesar's Tower contained a grim basement dungeon; according to local legend dating back to at least 1644 it is also known as Poitiers Tower, either because prisoners from the Battle of Poitiers in 1356 may have been imprisoned there, or because the ransoms raised from the battle helped to pay for its construction. The gatehouse features murder holes, two drawbridges, a gate, and portcullises – gates made from wood or metal. The towers of the gatehouse were machicolated.