St Piran was born in Ireland in the 5th century and then went to Rome to study the Bible and when he came back to Ireland he was made a bishop.
It was said that he performed many miracles, such as raising from the dead soldiers who had died battle, but the Irish Kings were afraid of these miraculous powers. They threw him into the sea with a millstone around his neck, expecting him to drown. But instead he floated across the water and landed at Perran beach in Perranporth.
Here he built a small chapel, called an oratory (ora means prayer) among the sand dunes and people would come from miles around to hear him preach.
They say that St. Piran also discovered the metal tin, by accident. There was a black stone in his fire which started to leak white liquid.. this was the tin melting. The black and white flag of Cornwall is represents the black ore and white tin… though I have heard other interpretations of the black and white as well.