St David was born in Pembrokeshire in 500 AD.  He was the grandson of Ceredig ap Cunedda, King of Ceredigion.

According to legend his mother, Non, or St Non, gave birth to him on a Pembrokeshire cliff top during a fierce storm. In the Ancient World it was important for a famous person to be credited with a remarkable birth.  The truth is that we don’t really know anything about his birth.  Even the date is uncertain.  Some sources think he was born in Ceredigion.

He died on 1st March 589 in St David’s and was later made a saint in 1123 by Pope Callixtus.
St David was a Celtic monk and became Bishop of St Davids. Once, while preaching, it is said that he held a handkerchief on the ground and stood on it, upon which a hill rose up beneath him and all the people around could hear his preaching.  A white dove is said to have sat on his shoulder.
In daily life St David is said to have drunk water and eaten mostly bread and herbs.  He was particularly fond of watercress, and possibly, leeks?

His last words to his followers are said to have come from a sermon he had recently delivered: ‘Be joyful, keep the faith and do the little things that you have heard and seen me do.’  ‘Gwnewch y pethau bychain mewn bywyd’ / ’Do the little things in life’.

He was supposed to have urged Welsh warriors to wear leeks in their helmets when fighting the English.  However, the idea that he, St David, was the first to grow leeks, as has been alleged, is unlikely as they were already well known in the Middle East in Biblical times and widely eaten later by the Romans, as can be seen in the recipes of Apicius, a Roman chef, whose recipes are known to us today.  Indeed, the Emperor Nero is said to have eaten them to improve his singing voice. 
And this is why the Welsh are such good singers!