Saint-Sulpice is a Roman Catholic church in Paris, France, on the east side of the Place Saint-Sulpice within the rue Bonaparte, in the Luxembourg Quarter of the 6th arrondissement. At 113 metres long, 58 metres in width and 34 metres tall, it is only slightly smaller than Notre-Dame and thus the second largest church in the city. It is dedicated to Sulpitius the Pious. During the 18th century, an elaborate gnomon, the Gnomon of Saint-Sulpice, was constructed in the church.