text: In the grandiose interior , the luminous 12th- and 13th-century mosaics of the nave and apse depict the complete cycle of the Old Testament , replete with a 66-ft high Christ Pantocrator with saints , while the aisle mosaics narrate the miracles of Jesus .
  
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  Inside there are 12th and 13th century mosaics that depict the full cycle of the Old Testament .