The Rue des Changes lies opposite the south-west corner of the Cathedral. Pursue this street and you will find yourself in the modern vegetable market--the Place Billard. It is the site on which--coolly appropriating some territory which belonged to the Monastery of S. Père--Thibault built the castle and donjon of the Counts of Chartres. It was outside the then walls of the town, between the Porte Évière and the Porte Cendreuse. Not a vestige of it now remains, if we except a few fragments of the old enclosing wall. For the donjon was destroyed in [Illustration: South Transept] 1587, and the castle in the nineteenth century. The great tower known as the King’s or Count’s Tower (Tour le Roi, Tour le Comte), was used for a prison, and within the spacious halls of the ancient palace most of the general assemblies of Chartres were held. It was here that for five centuries justice was administered, and it was in the chapel of the castle that the bishop, on his entry, was wont to swear that he would not go contrary to the rights of the prince. And it was here that feudal homage was done, _à cause de la grosse tour de Chartres_. The castle, with its crenelated donjon, its huge façade on the crest of the hill, its massive walls and buttresses; the Cathedral, with its soaring spires, majestic nave and mystic sculptures, were typical in their juxtaposition. The fortress of the Counts, rising behind armed walls and portcullis; the stronghold of the bishops, secure within the buildings of the cloister, to which there was access only through guarded gates--such, for instance, as that facing the castle, of which you may still see a trace on the corner house of the Rue des Changes and the Rue du Lait--Castle and Cathedral so placed were stone symbols, you might fancy, of the temporal and spiritual powers which ruled with divided sway the old town of Chartres.[34]