Nantes Cathedral or the Cathedral of St. Peter and St. Paul, Nantes (French: Cathédrale Saint-Pierre-et-Saint-Paul de Nantes), is a Gothic Roman Catholic cathedral in the city of Nantes, Pays de la Loire, France. The construction of the cathedral began in 1434, on the site of a Romanesque cathedral, and took 457 years to finish, finally reaching completion in 1891.