St Piran is the patron saint of Cornwall, a region in the southwest of England. He is believed to have lived during the 5th century and is often associated with the introduction of Christianity to Cornwall. St Piran is also known for his connection to tin mining, which was a significant industry in the area. The feast day of St Piran is celebrated on March 5th, and it is marked by various festivities, including parades and traditional music. His emblem, a white cross on a black background, is featured on the Cornish flag, symbolizing the rich cultural heritage of Cornwall.