St. Pelagius Cathedral is a prominent religious structure located in the city of Civita Castellana, Italy. This cathedral is dedicated to Saint Pelagius, a Christian martyr, and showcases a blend of architectural styles, primarily Romanesque and Gothic. Its construction began in the 11th century and features beautiful frescoes and intricate stone carvings. The cathedral serves as the seat of the Bishop of Civita Castellana and plays a significant role in the local community. Visitors can admire its stunning façade and explore the interior, which includes a striking altar and various chapels dedicated to different saints.