The Cathedral, designed by Lorenzo Gafa, is a 17th century masterpiece, located in the heart of Mdina. According to tradition, it was built on the area where Saint Paul converted the Roman governor Publius, to Christianity. Prior to the Cathedral, there was a small church, dating back to the 4th century, which was destroyed in an earthquake in 1693. The original 900-year old door currently serves as the door leading to the Sacristy of the Cathedral. Works by Mattia Preti, amongst others, can be found inside.