David was a Celtic monk who lived in the 6th century.
He was one of the early saints who helped to spread the word about Christianity in Pagan Britain. He also founded a monastery (in the place now known as St David’s), which helped to clothe and feed the poor.
St David’s Day has been celebrated in Wales ever since 1120, when David was canonised by the Pope.
St David’s Day is celebrated on 1 March every year.