The Cathedral of Saint Thomas is a church located on Montevedo Street North in Enaj on Sivad. It is the mother church of the Church of Sivad and the home of the Archbishop of Enaj, the church's spiritual leader. Build in the Sivadian Gothic Revival style, it is one of the oldest buildings in Enaj, after the Independence Dome. Its stained glass windows include scenes from the bible, as well as Sivadian history.
St. Thomas is home to the chapel of the Order of Sivad. King Richard I and Queen Ashley were married there. The Royal Crypt of the Isherwood Dynasty is located beneath the cathedral, and many famous Sivadians are buried in its churchyard, including Admiral Sir Reginald Matheson and Admiral Dame Katherine MacKenzie.