The marble work of the sanctuary is fittingly the richest in color and design in the church. Rosso Levanto and Verde Issorie cover the floor and steps, while a deep purple Rouge Royal serves as the wainscot of the walls. The Rouge Royal has been set in a manner so that the slabs mirror each other, creating a pattern on the rear and sidewalls. In ancient times the color purple was only worn by the imperial family and came to be associated with Christ as King