 At the same time that the Saint-Chapelle was built, stained glass rose windows, eighteen meters high, were added to the transept of Notre Dame Cathedral.Beginning in the reign of Charles VI (1380–1422), French noblemen and wealthy merchants began building large townhouses, mostly in the Le Marais neighborhood that were usually surrounded by walls and often had gardens.King Charles and Queen Isabeau of Bavaria spent most of their time in their own house in that neighborhood, the Hôtel Saint-Pol, which had been built by Charles V. Louis d'Orléans, the brother of the Charles VI, had nine separate residences in the city, including the Hôtel des Tournelles, whose site became the Place des Vosges in about 1600.