The Cathedral of Saint Mary is a Roman Catholic cathedral located in the city of La Seu d'Urgell, Spain. It is the seat of the Bishops of Urgell, who together with the president of the French Republic are one of the Co-Princes of Andorra. The cathedral is the seat of the Roman Catholic Diocese of Urgell, the includes also the country of Andorra.
The cathedral is considered unique within Catalan Romanesque architecture for the Italianate-style features on the ornaments of its west front.
The Diocese of Urgell (Catalan pronunciation: [uɾˈ(d)ʒeʎ]; Latin: Diœcesis Urgellensis) is a Latin Church diocese of the Catholic Church in Catalonia (Spain) and the Principality of Andorra in the historical County of Urgell, with origins in the 5th century AD or possibly earlier. It is based in the region of the historical Catalan County of Urgell, though it has different borders. The seat and cathedral of the bishop are situated in la Seu d'Urgell town. The state of Andorra is a part of this diocese.
Among its most notable events are Bishop Felix's adoptionist revolt, the coup of Bishop Esclua, and the overthrowing of the bishop by members of aristocratic families (namely Salla i Ermengol del Conflent, Eribau i Folcs dels Cardona, Guillem Guifré de Cerdanya and Ot de Pallars) between the years 981 and 1122.