The subterranean cells of the Bastille did not differ much from those of the Châtelet. There were several, the bottoms of which were formed like a sugar-loaf upside down, thus neither allowing the prisoner to stand up, nor even to adopt a tolerable position sitting or lying down. It was in these that King Louis XI., who seemed to have a partiality for filthy dungeons, placed the two young sons of the Duke de Nemours (beheaded in 1477), ordering, besides, that they should be taken out twice a week and beaten with birch rods, and, as a supreme measure of atrocity, he had one of their teeth extracted every three months. It was Louis XI., too, who, in 1476, ordered the famous iron cage, to be erected in one of the towers of the Bastille, in which Guillaume, Bishop of Verdun, was incarcerated for fourteen years.