staircases; part of one stairway is still in place. The hall was divided into four naves by a row of massive pillars in the center, flanked by two rows of cylindrical columns. Heat was provided by four large fireplaces around the hall. Thanks to the support of the columns and pillars, the hall originally had large windows, which were mostly sealed off in the 17th century when the Galerie Dauphine was built, though traces of them are still visible on the south wall. In 1364, when Charles V left the palace, the hall was modified for its new prison functions. the last bay on the west was raised in height and separated by bars from the rest of the hall. This became the "Rue de Paris", the secure route to the prison cells, named after "Monsieur de Paris", the nickname of the city's executioner. Hall of the Guards The Hall of the Guards (Salle des Gardes) was built by Philip IV at the same time as the Hall of the Men-at-Arms, in the early 14th century. It is on the north or the old palace, between the Tower of Caesar and Silver Tower and the Seine, and the private garden of the King on the west. It was first occupied by The Royal Guard, and later was used as the antechamber of the Parliament, which was located directly above. It is smaller than the Hall of the Men-art-Arms, 21.8 meters long, 11.7 meters wide, and 8.3 meters high. The rib-vaulted vaulted roof, supported by three massive pillars, divides it into two naves. Like the hall of the Men-at-Arms, it was connected with the room above by a spiral stairway. When King Charles V moved the royal residence from the City Palace to the Louvre, the Hall of the Guards was converted into a prison. It was divided into dungeons for destitute prisoners. called "pailleux" or "Straw-sleepers", who were fed with only bread and water, and slept on the floor. It was usually overcrowded, with prisoners sometimes required to sleep in shifts. From 1780 onwards, male prisoners were able to get some exercise in the neighbouring courtyard. During the Reign of Terror, the Hall was used to confine prisoners before their trials in the courtroom of the Revolutionary Tribunal, in the hall above. The cells became so crowded that a second level, built of wood and accessed by ladders, was put