Tesoro della Cattedrale
The Treasure of the Cathedral is preserved in the crypt and includes a collection of works of art dating from the age of the Normans and the nineteenth century. In 1781 the tombs of Norman kings were reconnoitered and the artifacts wich were found went to form the oldest part of the collection. Among them is the crown of the first wife of Frederick II of Svevia, Empress Constance of Aragon. There are also a miniated breviary from the half of the fifteenth century, a cup, always fifteenth century, under the brand name of the Maestranza of Goldsmiths and Silversmiths of Palermo and a reliquary of the Cross dated back to the sixteenth century. Of the eighteenth century is the reliquary of Santa Rosalia, in the form of a statue and the monstrance of Salvatore Mercurio. Then there are ornate vestments and liturgical ornaments in silver.