Saint Januarius, also known as San Gennaro, is a Christian martyr and the patron saint of Naples, Italy. He lived during the 3rd century and is celebrated for his steadfast faith during the persecution of Christians. His feast day is observed on September 19, and he is often depicted holding a phial of his blood, which is said to liquefy annually. The most famous miracle associated with Saint Januarius is the liquefaction of his blood, which occurs during a special ceremony in Naples. This event is believed to signify the saint's protection over the city. Many people visit the Cathedral of Naples to witness this phenomenon and to seek his intercession.