Named after Ruggero di Altavilla, first Norman King of Sicily, but it’s stupendous decorations are because of his son Guglielmo I detto il “Malo” (and they should be coeval to the lateral naves in the Cappella Palatina). The mosaics are of great esteem, they do not represent sacred elements but bear elements of vegetation and animal forms (the hunting scenes and symbols of the Norman power). They tell hunting stories with archers and deers, they also represent peacocks and other exotic animals including leopards, everything with an attempt to show the allegory of the Norman court. The table in the center of the room is a very fine object of neoclassic style, elaborated with petrified sequoia fossil and with amethyst paste.