Saint-Sulpice is a Roman Catholic church on the east side of the Place Saint-Sulpice, in the Luxembourg Quarter. It is dedicated to Sulpitius the Pious. During the 18th century, an elaborate gnomon, the Gnomon of Saint-Sulpice, was constructed in the church.
The Saint Sulpice church was started in 1646 by Le Vau and that it was not finally completed until some 134 years later, after six different architects had worked on it. By the year 1733, all that remained to be built of Saint Sulpice's was the facade, and then it was decided, as so often happens in churches that are a long time in the building -and the wonder is that it did not happen more often-to change its style. The interior had been built in the Jesuit style, but when the Italian architect Servandoni was commissioned to build the facade, he built it in the classical style, and that is the facade you see there now-with certain exceptions.