Maillezais Cathedral is a ruined Roman Catholic cathedral in the commune of Maillezais in the Vendée, France, which was constructed between the 11th and 15th centuries. Formerly the Abbey of Saint-Pierre, it was once part of the Diocese of Luçon and had St. Peter as its Patron Saint. The ruins, consisting of a church, refectory, dormitory, kitchen, cellars, turrets and ramparts, have been declared a heritage monument in reflection of their Romanesque, Gothic, and Renaissance form.Photo: Selbymay