The Chapelle Sainte-Ursule de la Sorbonne, is the chapel of the University and is part of the mid-16th century Counter-Reformation building program in Paris; 77 religious houses were established in Paris between 1600 and 1677. Roman influence is at its most concentrated in Le Mercier's church at the Sorbonne (1635-1648), the University of Paris. This is one of his most important and successful works and is the only surviving building at the Sorbonne of several on which he had been working for Cardinal Richelieu since 1626. In the choir is the tomb of Richelieu by Girardon (1628-1715).