What is cornish flags?

Cornish flags, also known as the St. Piran's flag, is a white flag with a black diagonal cross, typically used to represent Cornwall, a Celtic region in southwestern Great Britain. The flag depicts the famous Cornish saint, St. Piran, who is said to have discovered tin in Cornwall. The colors of the flag also symbolize the white beach and black rocks of the Cornish coast. The Cornish flag is widely used as a symbol of the Cornish identity and heritage, and is seen on many public buildings, flags, clothing, and merchandise. It has been recognized as the official flag of Cornwall since 2002, and is flown on a number of occasions, including St. Piran's Day, which is celebrated annually on March 5th.