Although Naples became known as "City of Blood" (""), legends of blood liquefaction are not a unique phenomenon. Other examples include vials of the blood of Saint Patricia and Saint John the Baptist in the monastery of San Gregorio Armeno, and of Saint Pantaleon in Ravello. In all, the church has recognized claims of miraculous liquefying blood for seven or about twenty saints from Campania and virtually nowhere else. The blood cults of the other saints have been discontinued since the 16th century, which noted skeptic James Randi takes as evidence that local artisans or alchemists had a secret recipe for manufacturing this type of relic. A team of three Italian chemists managed to create a liquid that reproduces all the characteristics and behavior of the liquid in the vial, using only local materials and techniques that were known to medieval workers. Jordan Lancaster leaves open the possibility that the practice was a Christian survival of a pagan ritual intended to protect the locals from unexpected eruptions from Mount Vesuvius.