Susa Cathedral is the seat of the Bishop of Susa and is dedicated to Saint Justus of Novalesa. In origin it was the church of the Benedictine Abbey of St. Justus, established in 1029 by Marchese Olderico Manfredi to house the newly discovered relics of Saint Justus. The church was built around 1100 and has since been refurbished and restored several times. It was not until 1772 that the bishopric of Susa was created from the territory of the abbey, previously a territorial abbacy, and at that point the abbey church was made the cathedral of the new diocese.
The cathedral is a Romanesque style building. The façade has terracotta decorations and is joined to a Roman gate of the 4th century, the Porta Savoia, to the south. Halfway along the south side stands the campanile, with six levels of mullioned windows.
The interior is on the Latin Cross plan, with three aisles. It contains a baptistry which is earlier than the present church, and a statue supposedly of Adelaide, Marchioness of Turin, daughter and heiress of Olderico Manfredi and wife of Otto, Count of Savoy, ancestress of the Royal House of Savoy.
References:The first written record of church in Danmark locality date back to the year 1291. Close to the church are several stones with a Christian text and cross inscribed. The oldest parts of the present red-brick church are from the 1300s. In the late 1400s the church was enlarged to the appearance it has today. The church has been modified both internally and externally several times, among other things after the fires in 1699 and 1889. There are lot of well-preserved mural paintings in the walls.