Notre Dame de Paris is a Gothic cathedral on the eastern half of the Île de la Cité in Paris, France, with its main entrance to the west. Construction began in 1163, during the reign of Louis VII, and opinion differs as to whether Maurice de Sully or Pope Alexander III laid the foundation stone of the cathedral. However, both were at the ceremony in question. Bishop de Sully went on to devote most of his life and wealth to the cathedral's construction.