St. Januarius is a Christian martyr and the patron saint of Naples, Italy. He lived during the 3rd century and is known for his steadfast faith and miraculous acts. His feast day is celebrated on September 19, and he is often depicted in art holding a phial of his blood. One of the most famous legends associated with St. Januarius is the liquefaction of his blood, which occurs several times a year. This phenomenon is believed to be a sign of his intercession and is a significant event for the people of Naples, drawing many pilgrims and tourists to witness the miracle.