St. Piran is the patron saint of Cornwall, a region in the southwest of England. He is believed to have lived during the 5th or 6th century and is often associated with the introduction of Christianity to the area. St. Piran is also known for his connection to tin mining, which was a significant industry in Cornwall. His feast day is celebrated on March 5th, and many locals participate in various festivities, including parades and traditional music. St. Piran's flag, featuring a white cross on a black background, is a symbol of Cornish identity and pride, often displayed during cultural events.