Cathedral of Jaca

Cathedral of Saint Peter the Apostle of Jaca Catedral de San Pedro Apóstol
Side entrance of the Cathedral of Jaca
Basic information
Location	Jaca, Spain
Geographic coordinates	42°34′13.8″N 0°32′56.8″W / 42.570500°N 0.549111°W / 42.570500; -0.549111Coordinates: 42°34′13.8″N 0°32′56.8″W / 42.570500°N 0.549111°W / 42.570500; -0.549111
Affiliation	Roman Catholic Church
Country	Spain
Ecclesiastical or organizational status	Cathedral
Heritage designation	Bien de Interés Cultural
Leadership	Vacant
Architectural description
Architectural type	Church
Architectural style	Romanesque, Gothic, Baroque, Renaissance
Groundbreaking	11th century
Completed	12th century

The Cathedral of St Peter the Apostle (Spanish: Catedral de San Pedro Apóstol) is a Roman Catholic church located in Jaca, in Aragon, Spain. It is the seat of the Roman Catholic Diocese of Jaca.

It is the first Romanesque cathedral built in Aragon (1070s-early 12th century) and one of the oldest in the Iberian peninsula. Its current appearance is the result of later additions and modifications introduced especially in modern times (late 15th-late 18th centuries). The cathedral was erected by will of King Sancho Ramírez, who, after renovating in Rome his vassal oath to the Pope (1068), had obtained by the latter the right to establish the episcopal seat in Jaca, then capital of the Kingdom of Aragon.

After Jaca became the capital of Aragon (1036), the city obtained the status of episcopal see in 1077. This made the construction of a cathedral church necessary. The starting date of the construction is unknown, but it is generally set at around that date. The main section of the church was completed around 1130. In 1395 a fire destroyed the cathedral's ceiling, which was rebuilt in the following years and was substantially renovated in the early 16th century. In the same period the aisles were added and the central nave was enlarged. In Baroque times were the St. Horosia Chapel, the loggia and the cloister, while the interior received an altarpiece and other decorations.

In the late 18th century one of the apses was demolished and rebuilt, and the central one was renovated.

The cathedral has a generally Romanesque structure, although several elements are in Gothic, Renaissance and Baroque style. The plan is on a nave and two aisles, with three apses and two external portals, both provided with loggias (one of which in Renaissance style). Only one of the current apses is original. Of the other two, the central one was renovated in the 18th century, and the other one rebuilt in the same age.