Saint Piran's Flag (Cornish: Baner Peran) is the flag of Cornwall, in the United Kingdom. The earliest known description of the flag as the Standard of Cornwall was written in 1838. It is used by Cornish people as a symbol of identity.It is a white cross on a black background.
The flag is attributed to Saint Piran, a 6th century Cornish abbot. Saint Piran is supposed to have adopted these two colours from seeing the molten tin spilling out of the black ore in his fire. This occurred during his supposed discovery of tin in Cornwall, thus becoming the patron saint of tin miners.