The colonnade of the piazza of Saint Peter's, Rome, with the obelisk seen through an arch

This was drawn during Louis's sojourn at the French Academy in Rome between September 1756 and September 1759. Another view of Saint Peter's colonnade by Louis is at Quimper (S. Barthélémy, Dessins Français XVIIe-XIXe siècles, exhib. cat., Quimper, Musée des Beaux-Arts, 1999, no. 37). Two drawings of the inside of the basilica of Saint Peter are in the Louvre (inv. 30862) and Dijon (inv. 1883, 878).