The Great Mosque of Córdoba is also the Cathedral of Our Lady of the Assumption.
A Muslim Emir and his descendants built the Mezquita on the site of the Catholic Basilica of Saint Vincent of Lérins, a Visigoth temple, over 2 centuries starting in 784. After Córdoba returned to Christian rule in 1236 during the Reconquista, and the building was converted to a Roman Catholic church, culminating in the insertion of a Renaissance cathedral nave in the 16th century