La Seo Cathedral, Zaragoza

The Cathedral of the Savior (or Catedral del Salvador in Spanish) is a Roman Catholic cathedral in Zaragoza, Spain. It is part of the World Heritage Site Mudéjar Architecture of Aragon.
The cathedral is located on the Plaza de la Seo and is commonly known as La Seo (Spanish for "see") to distinguish it from the nearby El Pilar, whose name (pillar) is a reference to an apparition of Mary in Zaragoza (also known as Saragossa). The two share co-cathedral status in metropolitan Zaragoza.
The location of the Seo has its roots in the old Roman forum. Unlike other Roman city forums, the forum of Caesaraugusta was not located at the confluence of the Cardus and the Decumanus, but instead near the Ebro river, adjoining the river port. The forum, besides being the civic and commercial center of the city, contained the main temple. The Museum of the Forum is found below the plaza del Pilar, across from the facade of the cathedral. There have been no remains found of either a Visigoth or a Mozarabic church.Hanas ben Abdallah as San'ani (? – 718), a disciple of someone close to Mohammed, built the main mosque of Saraqusta al Baida, Zaragoza la Blanca, according to al-Humauydí (1029-1095). The main mosque is certainly one of the oldest of Al-Andalus. The edifice underwent two additions, one in the 9th century and one in the 11th century, under the Taifa king of Zaragoza, Mundir I. During the restoration completed in 1999, a number of remains were discovered, such as the impression of the minaret on the external walls, and the floor of the ancient structure. In addition, the entrance was located in the same place as that of the current cathedral.

The arrival in Zaragoza in 1118 of Alfonso I, the Battler did not lead to the immediate demolition of the mosque. He gave the Muslims one year to move out of the town, and on October 4, 1121, the building was consecrated under the name San Salvador, and the necessary renovations were made to allow the building to be used for Christian purposes.
La Seo was built on the site of the ancient Roman forum of Caesar Augustus and of the main mosque of the Moorish city of Saraqosta, elements of whose minaret form part of the current tower. The construction began in the 12th century in the Romanesque style, and underwent many alterations and expansions until 1704, when the Baroque spire completed the tower.

The cathedral is a mixture of styles, from the Romanesque apse (12th century) to the Baroque tower and Neo-Classical main door (18th century), passing through Mudéjar and Gothic. Of the diverse styles that make up La Seo Cathedral, the most important elements are:

Romanesque: in the exterior and the lower part of the apse. The Roman interior of the apse still remains, but is now covered by the Gothic altarpiece. In the sacristy are the "olifante" by Gastón de Bearn, built in ivory in the 11th century, and the relic-busts of Valerius of Saragossa (patron saint of Zaragoza), Saint Vincent of Saragossa, and St. Lawrence donated by the antipope Benedict XIII.
Gothic: mixed with Mudéjar, especially in the upper part of the exterior of the apse. The three central naves with their arches and tracery. Magnificent altarpiece largely of painted alabaster made by Pere Johan and Hans de Suabia. Choir stalls. Museum of flamenco tapestries from the 15th, 16th and 17th centuries, one of the three largest such collections in the world.
Mudéjar: exterior wall of the Parish of San Miguel and its interior roof, gilded with wood. The Aragonese Mudéjar has been named a World Heritage Site.
Renaissance: In the Parroquieta of San Miguel, the tomb of the archbishop Don López Fernández de Luna from the 16th century. Dome with Mudéjar influences, built in the first third of the 16th century to replace the older Moorish dome.
Baroque: Tower and gate.
The cathedral's museum is currently (as of 2006) being restored and is closed to the public.