work, the most beautiful that France has ever seen." The only surviving portions of the great hall are the Hall of the Men-at-arms and the Hall of the Guards below. Philip IV continued the rebuilding between 1285 and 1314. The Grand Hall was built, replacing a smaller earlier hall. The Grand Chamber became the official seat of the Parliament; and he added the silver tower and the Tower of Caesar. Under Charles V (1364–80),the role of the building changed. He decided to move his residence to the Louvre Palace, and the Hotel Saint-Pol. The concierge of the old palace was given greater authority over lower and middle courts. Prison cells were gradually added to the lower parts of the building, and it became known as the "Conciergerie". Its prisoners were a mixture of common criminals and political prisoners. In common with other prisons of the time, the treatment of prisoners was dependent on their wealth, status and associates. Wealthy or influential prisoners usually got their own cells with a bed, desk and materials for reading and writing. Less-well-off prisoners could afford to pay for simply furnished cells known as pistoles, which would be equipped with a rough bed and perhaps a table. The poorest would be confined to dark, damp, vermin-infested cells known as oubliettes (literally "forgotten places"). In keeping with the name, they were left to live or die in conditions that were ideal for the plague and other infectious diseases, which were rife in the unsanitary conditions of the prison. 15th-18th century Without the king as a permanent resident, the buildings underwent many changes to fit its judicial and prison role. Louis XII had the Chamber des Comptes reconstructed, and redecorated the Grand Chamber, used by the Parliament of Paris. A flood of the Seine in the winter of 1689-1690 caused important damage to the lower building, while a fire in 1737 destroyed the Chamber des Comptes. It was rebuilt by Jacques Gabriel. Another fire within the palace in 1776 caused even greater damage, reaching the chamber of the King, the gallery of merchants, and the main tower. The reconstruction following the 1776 fire added new cells to the ground level of the Conciergerie, and replaced the 12th century oratory with the present Chapel. The Conciergerie and the Reign of Terror The Palais de la Cité and the Conciergerie played a central role in the French Revolution. On