St David is the patron saint of Wales and also of doves. Also known as Dewi Sant in Welsh, he was born in Caerfai in Pembrokshire, Wales to Sant, a prince of Cardigan, and St Non, the daughter of a chieftain in around 500 AD. He was recognized as a national patron saint at the height of Welsh resistance to the Normans.

St David studied under St Paulinus in Cardigan before he went on pilgrimages, travelling to Wales, Cornwall, Britanny, Ireland and Jerusalem, where he was made an archbishop.
He helped to spread the word of Christianity, and he founded around 12 monasteries in his lifetime. He also helped to suppress Pelegrian heresy, where people believed that original sin did not taint human nature and people are capable of choosing good or evil without divine aid.

While little is known about St David's life, he is known for performing miracles. His most famous miracle was when he was preaching to a large crowd at the Synod of Brefi and raised the ground beneath him into a hill so his sermon could be heard by all.

St David also lived after eating bread poisoned by monks at his monastary who tired of their life of austerity, and restored the sight of his tutor, St Paulinus.

The flag of St David is a yellow cross on a black background.On St David's Day, the flag of St David and Y Ddraig Goch (the Red Dragon, Wales's national flag), will be flown more than usual.