A church existed in the site from 755. In 1129 Bishop Peter III commissioned a new edifice in the latest architectural style from Raimundo, a local architect and builder. This Romanesque structure was completed in 1273.
Later renovations and restorations added elements in other styles, such as the Renaissance retablo at the high altar. It was destroyed in the 1755 Lisbon earthquake and fragments of it are housed in the church.
The cathedral received from the Pope the privilege to permanently expose the Holy Sacrament.
The northern entrance's narthex is in Gothic style, dating to 1510-1530. Internally showing a starred vault, it is formed by three archivolts with a lintel showing Christ Pantocrator and with a pinjante (glove-shaped decorative pendant) that features a depiction of the Last Supper.
To the right of the entrance is the Gothic Torre Vella (bell tower), surmounted by a Renaissance top floor finished by Gaspar de Arce in 1580. The sacristy (1678) and the cloister (1714) are in the Baroque style, as is the central chapel of the triforium (1726). The chapel of St. Froilán is in Renaissance style, dating to the 17th century. Notable is the choir, built by Francisco de Moure (early 17th century).
View with the bell tower and the Gothic-style rear, featuring buttresses.
Cloister
Main Nave
Ambulatory
Chapel of the Virgin of the Big Eyes
References
Cegarra, Basilio (1992). Guia da arte de Galicia. Vigo.{{cite book}}: CS1 maint: location missing publisher (link)