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