St David's Day is celebrated in Wales on 1 March, in honour of St David (Dewi Sant), the patron saint of Wales. He was a Celtic monk, abbot and bishop, who lived in the sixth century. He spread the word of Christianity across Wales. The most famous story about Saint David tells how he was preaching to a huge crowd and the ground is said to have risen up, so that he was standing on a hill and everyone had a better chance of hearing him. St David's Day is commemorated by the wearing of daffodils for women and leeks for men. Both plants are traditionally regarded as national emblems. On St David's Day, some children in Wales dress in their national costume, which consists of a tall black hat, white frilled cap and long dress. The national flag of Wales, depicting a fiery red dragon (Y Ddraig Goch) against a green and white background, is also flown.