Santa María de Regla de León Cathedral is a Catholic church, the episcopal see of the diocese of León in north-western Spain, consecrated under the name of the Virgin Mary. It was the first monument declared by the Royal Order of Spain on August 28, 1844 (confirmed by the Royal Order on September 24, 1845). Initiated in the 13th century, it is one of the greatest works of the Gothic style, with French influences. Also known as the Pulchra Leonina, which means ‘Beautiful Leonese’, it is located on the Way of Saint James, or Camino de Santiago. The León Cathedral is mostly known for taking the “dematerialization” of gothic art to the extreme, that is, the reduction of the walls to their minimum expression to be replaced by stained glass, constituting one of the largest collections of medieval stained glass in the world. Current structure León Cathedral, dedicated to Santa María de la Regla, was declared of Cultural Interest in 1844. It is known as the Pulchra Leonina and is a masterpiece of the Gothic style of the mid-13th century. The design is attributed to the architect Enrique. By the mid 15th century it was virtually completed. The main façade has two towers. The southern tower is known as the 'clock tower'. The Renaissance retrochoir contains alabaster sculptures by Jusquin, Copin of Holland and Juan de Malinas. Particularly noteworthy is the Plateresque iron grillwork screen or reja in the wall behind the sepulcher of King Ordoño. It has three portals decorated with sculptures situated in the pointed arches between the two towers. The central section has a large rose window. Particularly outstanding is the image of the Virgen Blanca and the Locus Appellatione, where justice was imparted. The church has nearly 1,800 square meters of stained glass windows. The great majority of them date from the thirteenth to the fifteenth century: a rarity among medieval gothic churches. In the Main Chapel, there is an altarpiece by Nicolás Francés (15th century) and a silver urn containing the relics of San Froilán, the town's patron saint, made by Enrique de Arfe. The 13th- to 15th-century cloister contains sculpted details in the capitals, friezes, and ledges. The Cathedral Museum houses a large collection of sacred art. There are almost 1,500 pieces, including 50 Romanesque sculptures of the Virgin, dating from prehistoric times to the 18th century (Neoclassicism) with works by Juan de Juni,