520-Born a son of Sant, a Brythonic sub-king of Ceredigion and Non (see St Nonna), daughter of a Goedelic notable, and was a cousin of many other Welsh Saints.
He studied for 10 years at Ty Gwy (not Whiteland ) near St David's in Wales.
He founded TY Ddewi (St David's and many other monastic centres.
He went to strengthen Christianity in Ireland for Ainmire, its High King.
Note.
William of Worcester states that St David was born at Altarnon if so making him Cornish by birth.
In Geoffrey of Monmouths 12th century history of Britain fancifully suggests that King Arthur was David's nephew.