St Piran's Flag is a black flag with a white cross, representing the patron saint of Cornwall. The design is simple yet striking, symbolizing the region's rich mining heritage and its connection to the tin industry. The flag is celebrated during St Piran's Day, which falls on March 5th each year. This day honors St Piran, who is believed to have brought Christianity to Cornwall in the 5th century. The flag is often displayed at local events and parades, showcasing Cornish pride and cultural identity.