 In the 10th and 11th centuries, the Counts of Blois and landowners from Chartres and Champagne joined together to rebuild the fortress.Thibaud le Tricheur raised the “big tower” and by the end of the 12th century, the Counts contributions were finished by building the Saint-Sauveur.The "Salle des États Généraux", built in the beginning of the 13th century, is one of the oldest seignoral rooms preserved in France, and is also the largest remaining civilian Gothic room.