Katedral Idanha-a-Velha

The Cathedral of Idanha-a-Velha is a former cathedral in the civil parish of Monsanto e Idanha-a-Velha, in the municipality of Idanha-a-Nova, Castelo Branco District, Portugal. In the medieval period it served as the cathedral of the bishopric of Egitânia. The building is associated with Visigothic art and stands on Rua da Sé. It is classified as Immovable Cultural Heritage of Public Interest. It ceased to serve as a place of worship in the 19th century and is now used as a museum. Its use as a mosque during one phase of its history reflects the layered religious past of the site.

The bishopric of Egitânia was established in the 4th century, and work on the basilica is reported to have begun around the year 585.

During the Muslim conquest of the Iberian Peninsula the building was converted into a mosque. With the Reconquista it returned to the Catholic Church and was donated to the Templars.

It stopped functioning as a place of worship in the 19th century and today houses a museum.