In Search of Holy Treasure S01E12 - The Blood of Saint Januarius

Three times a year, the faithful of Naples congregate on the esplanade in front of the Cathedral of Santa Chiara. Hoping to witness a miracle, the priests remove a monstrance from its reliquary. Within it is a vial, a third fill of a blackish, solid substance. It is claimed that this is the coagulated blood of St. Januarius, the patron saint of the city, decapitated as a martyr in 305 A.D.