The chief gaoler is one of the overseers of the dungeons in the Red Keep and answers to the King's Justice. He has authority over the chief undergaoler. The Chief Gaoler's chambers are located between the ground floor of the Traitor's Walk and the entrance to the dungeons.
The last Chief Gaoler of the Red Keep had been a cloth merchant who purchased the office from Littlefinger during the reign of Robert Baratheon. After Robert's death, he became was one of the conspirators known as 'Antler Men', who sought to put Stannis Baratheon on the Iron Throne, for which he was imprisoned and later used as a catapult projectile by Joffrey during the beginnings of the Battle of the Blackwater.