A cathedral with the appearance of a military fortress.
The cathedral is Romanesque in origin, with Gothic elements and Renaissance ornamentation added at a later date.
Construction began in the 12th century on the orders of Bishop Bernardo de Agén; however, work continued until the 16th century. The church has three naves, a main chapel with an ambulatory and a dome. Its chapels include particularly the chapel of San Pedro with a wrought iron grille by Juan Francés; the Anunciación chapel, with Mudéjar details; and the San Marcos chapel. Los Arces chapel contains the mortuary statue of Martín Vázquez el Doncel, an exceptional work dating from the late 15th century. In the south-facing wall of the presbytery you will find the Gothic-style tomb of Bishop Alonso Carrillo de Albornoz, Cardinal of San Eustaquio, as well as that of the knight Gómez Carrillo de Acuña and his wife.