With the beautiful view of the original octagonal structure and the sarcofagus that surround the complete object, it is easy to notice the original, burial purpose of the building that initially was a mausoleum of the emperor and his family. It wasn’t until 7th century that it became a church, when the bishop Ivan from Ravenna came and organized church life after the fall of Salona
The crypt of the palace is the site of another, small church, dedicated to Saint Lucia of Syracuse, that is celebrated every 13th of December. It is said this is the oldest church in the world, knowing that it still keeps the original structure from 305AD. Interior is a masterpiece of Roman-Dalamtian cultural herritage, having the most beautiful romanic, wooden carved 13th century doors of master Buvina, gothic altars, done by George of Dalmatia stone workshops. It also keeps the sarcofagus of the two patrons of Split; saint Domnius (Duje) and saint Anastasius, both killed by emperor Diocletian.
The pulpit has been made of the stone taken from Diocletian’s apartment. Annex of this circular interior belongs to the church chore and on the upper floor is the treasury. The tower bell of the cathedral was built in the end of 12th century as the gift of the Croatian-Hungarian empress.