In this context, the central   
    chapel
    
  
  
 in the Cefalù Cathedral has a unique elongated shape which enhances its elevated volume, enclosed by two   
    ribbed cross vaults
    
  
  
, which virtually delimit the space of   
    Bema
    
  
  
.
At the front of the building, there are two symmetrically placed compartments in the side walls to connect the   
    Prothesis
    
  
  
 and the   
    Diaconicon
    
  
  
, dedicated to liturgical services.
The interior decoration is conspicuously divided, at the two cross vaults, with mosaics covering the entire eastern part, including the basin and the   
    apsidal dome
    
  
  
. The western area, extending up to the elevation of the arch facing the   
    transept
    
  
  
 is adorned with stuccoes and statues, commissioned by   
    Marco Antonio Gussio
    
  
  
 in the mid-17th century.

The   
    Baroque style
    
  
  
 was creatively used on this occasion to embellish this remaining part of the Bema, which was originally intended to house the medieval mosaics that completed the original iconographic programme.
Inside the Sanctuary, according to the Canonical Rite, the royal seat and the bishop’s chair were placed against each other on the walls, while in the centre, under the second cross of the Bema, decorated with mosaic images of   
    Seraphim and Cherubim
    
  
  
 was the   
    ancient altar
    
  
  
, embellished with a gold altarpiece and surmounted by a precious   
    ciborium
    
  
  
.
Today, the Cathedral houses a   
    new altar
    
  
  
, made of bronze, cast in wax and finished in pure gold.
