The new church was begun between 1165 and 1170 upon the foundations of the older church. It was built under King Louis VII, the founder of the University of Paris, and of Notre-Dame de Paris.Dumoulin (2010), "Églises de Paris", p. 94 It is thirty years younger than the Saint Pierre de Montmartre church, the construction of the famous Gothic ambulatory of the Basilica of Saint-Denis lay between them. It was inspired by the contemporary Notre Dame de Paris. The building effort was supported by the Clunaic monastic community of Longpont. Their enterprise resulted in the completion of the choir and, most likely, the nave (ca. 1210–1220).
