The Cathedral of Saint Domnius, known locally as the Saint Dujam (Sveti Dujam) or colloquially Saint Duje (Sveti Duje), is the Catholic cathedral in Split. The cathedral is the seat of the Archdiocese of Split-Makarska, headed by Archbishop Marin Barišić. The Cathedral of St. Domnius is a complex of a church, created from an Imperial Roman mausoleum, with a bell tower; strictly the church is dedicated to the Virgin Mary, and the bell tower to Saint Domnius. Together they form the Cathedral of St. Domnius.
Consecrated at the turn of the 7th century AD, it is regarded as the oldest Catholic cathedral in the world that remains in use in its original structure, without near-complete renovation at a later date. The structure itself, built in AD 305 as the Mausoleum of Roman Emperor Diocletian, is the second oldest structure used by any Christian Cathedral.
The Bell Tower was constructed in the year 1100 AD, in Romanesque style. Extensive rebuilding in 1908 radically changed the Bell Tower, and many of the original Romanesque sculptures were removed.
One of the best examples of Romanesque sculpture in Croatia, are the wooden doors on Cathedral of St. Domnius. They were made by the medieval Croatian sculptor and painter Andrija Buvina around 1220.
